Document:

EX-10.5

JOINDER AGREEMENT

THIS JOINDER AGREEMENT (this “Agreement”), dated as of August 8, 2006, is by and among
Lionbridge of Europe B.V., a company organized under the laws of The Netherlands (the “New
Foreign Holding Company”), Lionbridge Technologies, Inc., a Delaware corporation (the
“Company”), Lionbridge International (f/k/a Lionbridge Technologies Ireland) (the
“Irish Borrower”), Lionbridge Technologies Holdings B.V. (the “Existing Dutch Borrower
I”), Lionbridge Global Solutions Holdings (Netherlands) B.V (the “Existing Dutch Borrower
II” and together with the Existing Dutch Borrower I, the “Dutch Borrowers”), the
Material Domestic Subsidiaries of the Company party hereto (the “Guarantors”), the
Subsidiaries of the Irish Borrower and the Dutch Borrowers party hereto and Wachovia Bank, National
Association, in its capacity as administrative agent (the “Administrative Agent”) under
that certain Credit Agreement, dated as of September 1, 2005 (as amended, restated, supplemented or
otherwise modified, the “Credit Agreement”) by and among the Company, the Irish Borrower,
the Dutch Borrowers, the Guarantors, the Subsidiaries of the Irish Borrower and the Dutch Borrowers
from time to time party thereto, the lenders from time to time party thereto (the
“Lenders”) and the Administrative Agent. The Existing Dutch Borrower II became a Dutch
Borrower pursuant to that certain Joinder Agreement dated as of September 2, 2005 among the
Existing Dutch Borrower II, the Credit Parties party thereto and the Administrative Agent.
Capitalized terms used herein but not otherwise defined shall have the meanings provided in the
Credit Agreement.

The New Foreign Holding Company hereby agrees as follows with the Administrative Agent, for
the benefit of the Lenders, and the other parties to the Credit Agreement:

1. The New Foreign Holding Company hereby acknowledges, agrees and confirms that, by its
execution of this Agreement, the New Foreign Holding Company will be deemed to be a party to and a
“Foreign Guarantor” under the Credit Agreement and shall have all of the obligations of a Foreign
Guarantor thereunder as if it had executed the Credit Agreement. The New Foreign Holding Company
hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and
conditions contained in the applicable Credit Documents, including without limitation (a) all of
the representations and warranties set forth in Article III of the Credit Agreement and (b) all of
the affirmative and negative covenants set forth in Articles V and VI of the Credit Agreement.
Without limiting the generality of the foregoing terms of this Paragraph 1, the New Foreign Holding
Company hereby agrees to be jointly and severally liable for the Foreign Credit Party Obligations
of the Foreign Borrowers in accordance with Article XI of the Credit Agreement.

2. The New Foreign Holding Company acknowledges and confirms that it has received a copy of
the Credit Agreement and the schedules and exhibits thereto and each Security Document and the
schedules and exhibits thereto.

3. The Credit Parties confirm that the Credit Agreement is, and upon the New Foreign Holding
Company becoming a Foreign Guarantor, shall continue to be, in full force and effect. The parties
hereto confirm and agree that immediately upon the New Foreign Holding Company becoming a Foreign
Guarantor the term “Foreign Credit Party Obligations,” as used in the Credit Agreement, shall
include all obligations of the New Foreign Holding Company under the Credit Agreement and under
each other Credit Document.

4. Each of the Credit Parties and the New Foreign Holding Company agrees that at any time and
from time to time, upon the written request of the Administrative Agent, it will execute and
deliver such further documents and do such further acts as the Administrative Agent may reasonably
request in accordance with the terms and conditions of the Credit Agreement in order to effect the
purposes of this Agreement.

5. As soon as reasonably possible after the effectives of this Joinder Agreement, the Existing
Dutch Borrower II is to be merged (the “Merger”) with and into the New Foreign Holding
Company. Under Dutch law, as a result of the Merger, all rights and obligations of the Existing
Dutch Borrower II under the Credit Agreement and the other Credit Documents will transfer to the
New Foreign Holding Company by operation of law and the Existing Dutch Borrower II will cease to
exist. Upon consummation of the Merger, the New Foreign Holding Company will be deemed a “Dutch
Borrower” under the Credit Documents and the New Foreign Holding Company agrees from that time to
perform and discharge, all of the rights, obligations and liabilities of the Existing Dutch
Borrower II under the Credit Agreement and the other Credit Documents.

6. This Agreement may be executed in two or more counterparts, each of which shall constitute
an original but all of which when taken together shall constitute one contract.

7. This Agreement shall be governed by and construed and enforced in accordance with the laws
of the State of New York without regard to conflict of laws principles thereof (other than Sections
5-1401 and 5-1402 of The New York General Obligations Law).

1

IN WITNESS WHEREOF, each of the New Foreign Holding Company and the Credit Parties have caused
this Joinder Agreement to be duly executed by its authorized officer, and the Administrative Agent,
for the benefit of the Lenders, has caused the same to be accepted by its authorized officer, as of
the day and year first above written.

	 	 	 
	NEW FOREIGN HOLDING COMPANY:

	 	LIONBRIDGE OF EUROPE B.V.,
	 

	 	

	
 
	 	a company incorporated under

the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 
	COMPANY:

	 	LIONBRIDGE TECHNOLOGIES, INC.,
	 

	 	

	
 
	 	a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President and Chief Executive Officer
	 
	 	 
	IRISH BORROWER:

	 	LIONBRIDGE INTERNATIONAL
	 

	 	

	
 
	 	(f/k/a LIONBRIDGE TECHNOLOGIES IRELAND),

a company organized under the laws of Ireland
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Director
	 
	 	 
	DUTCH BORROWERS:

	 	LIONBRIDGE TECHNOLOGIES HOLDINGS B.V.,
	 

	 	

	
 
	 	a company incorporated under the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS HOLDINGS

(NETHERLANDS) B.V., a company incorporated under

the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 
	US GUARANTORS:

	 	VERITEST, INC.,
	 

	 	

	
 
	 	a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	MENTORIX TECHNOLOGIES INC.,

a California corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE US, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS COMPANIES, INC. f/k/a BGS COMPANIES, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS FEDERAL, INC. f/k/a BOWNE GLOBAL SOLUTIONS FEDERAL, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Director
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS II, INC. f/k/a BOWNE GLOBAL SOLUTIONS II, INC.,

a New York corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	FOREIGN GUARANTORS:

	 	LIONBRIDGE TECHNOLOGIES B.V.,
	 

	 	

	
 
	 	a company incorporated under the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 

2

Acknowledged, accepted and agreed:

WACHOVIA BANK, NATIONAL ASSOCIATION,

as Administrative Agent

By: s/Patricia S. Gaudreau

Name: Patricia S. Gaudreau

Title: Senior Vice President

3EX-10.6

JOINDER AGREEMENT

THIS JOINDER AGREEMENT (this “Agreement”), dated as of August 8, 2006, is by and among
Lionbridge Luxembourg Sarl, a société à responsabilité limitée (private limited liability company)
duly incorporated and validly existing under the law of the Grand-Duchy of Luxembourg, with
registered office at 1, rue des Glacis, L-1628 Luxembourg, having a share capital of EUR 1,750,925
in process of registration with the Luxembourg Registre de Commerce et des Sociétés (Trade and
Companies Register) (the “New Foreign Holding Company”), Lionbridge Technologies, Inc., a
Delaware corporation (the “Company”), Lionbridge International (f/k/a Lionbridge
Technologies Ireland) (the “Irish Borrower”), Lionbridge Technologies Holdings B.V. (the
“Existing Dutch Borrower I”), Lionbridge Global Solutions Holdings (Netherlands) B.V (the
“Existing Dutch Borrower II” and together with the Existing Dutch Borrower I, the
“Dutch Borrowers”), the Material Domestic Subsidiaries of the Company party hereto (the
“Guarantors”), the Subsidiaries of the Irish Borrower and the Dutch Borrowers party hereto
and Wachovia Bank, National Association, in its capacity as administrative agent (the
“Administrative Agent”) under that certain Credit Agreement, dated as of September 1, 2005
(as amended, restated, supplemented or otherwise modified, the “Credit Agreement”) by and
among the Company, the Irish Borrower, the Dutch Borrowers, the Guarantors, the Subsidiaries of the
Irish Borrower and the Dutch Borrowers from time to time party thereto, the lenders from time to
time party thereto (the “Lenders”) and the Administrative Agent. The Existing Dutch
Borrower II became a Dutch Borrower pursuant to that certain Joinder Agreement dated as of
September 2, 2005 among the Existing Dutch Borrower II, the Credit Parties party thereto and the
Administrative Agent. Capitalized terms used herein but not otherwise defined shall have the
meanings provided in the Credit Agreement.

The New Foreign Holding Company hereby agrees as follows with the Administrative Agent, for
the benefit of the Lenders, and the other parties to the Credit Agreement:

1. The New Foreign Holding Company hereby acknowledges, agrees and confirms that, by its
execution of this Agreement, the New Foreign Holding Company will be deemed to be a party to and a
“Foreign Guarantor” under the Credit Agreement and shall have all of the obligations of a Foreign
Guarantor thereunder as if it had executed the Credit Agreement. The New Foreign Holding Company
hereby ratifies, as of the date hereof, and agrees to be bound by, all of the terms, provisions and
conditions contained in the applicable Credit Documents, including without limitation (a) all of
the representations and warranties set forth in Article III of the Credit Agreement and (b) all of
the affirmative and negative covenants set forth in Articles V and VI of the Credit Agreement.
Without limiting the generality of the foregoing terms of this Paragraph 1, the New Foreign Holding
Company hereby agrees to be jointly and severally liable for the Foreign Credit Party Obligations
of the Foreign Borrowers in accordance with Article XI of the Credit Agreement.

2. The New Foreign Holding Company acknowledges and confirms that it has received a copy of
the Credit Agreement and the schedules and exhibits thereto and each Security Document and the
schedules and exhibits thereto.

3. The Credit Parties confirm that the Credit Agreement is, and upon the New Foreign Holding
Company becoming a Foreign Guarantor, shall continue to be, in full force and effect. The parties
hereto confirm and agree that immediately upon the New Foreign Holding Company becoming a Foreign
Guarantor the term “Foreign Credit Party Obligations,” as used in the Credit Agreement, shall
include all obligations of the New Foreign Holding Company under the Credit Agreement and under
each other Credit Document.

4. The New Foreign Holding Company agrees that it will promptly notify the Administrative
Agent of any new asset or assets acquired by the New Foreign Holding Company. The New Foreign
Holding Company and the Credit Parties agree (a) to promptly execute and deliver any security
document and to take all actions reasonably required by the Administrative Agent to provide the
Administrative Agent with a first priority perfected Lien in any new asset or assets acquired by
the New Foreign Holding Company and (b) that failure of the New Foreign Holding Company or the
Credit Parties to comply with the terms of this Section 4 shall constitute an Event of Default
under the Credit Agreement.

5. Each of the Credit Parties and the New Foreign Holding Company agrees that at any time and
from time to time, upon the written request of the Administrative Agent, it will execute and
deliver such further documents and do such further acts as the Administrative Agent may reasonably
request in accordance with the terms and conditions of the Credit Agreement in order to effect the
purposes of this Agreement.

6. This Agreement may be executed in two or more counterparts, each of which shall constitute
an original but all of which when taken together shall constitute one contract.

7. This Agreement shall be governed by and construed and enforced in accordance with the laws
of the State of New York without regard to conflict of laws principles thereof (other than Sections
5-1401 and 5-1402 of The New York General Obligations Law).

1

IN WITNESS WHEREOF, each of the New Foreign Holding Company and the Credit Parties have caused
this Joinder Agreement to be duly executed by its authorized officer, and the Administrative Agent,
for the benefit of the Lenders, has caused the same to be accepted by its authorized officer, as of
the day and year first above written.

	 	 	 
	NEW FOREIGN GUARANTOR:

	 	LIONBRIDGE LUXEMBOURG SARL,
	 

	 	

	
 
	 	a company incorporated under

the laws of Luxembourg
	 
	 	 
	
 
	 	By: s/Albert A. Barchard
	
 
	 	 
	
 
	 	Name: Albert A. Barchard

Title: Director
	 
	 	 
	COMPANY:

	 	LIONBRIDGE TECHNOLOGIES, INC.,
	 

	 	

	
 
	 	a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President and Chief Executive Officer
	 
	 	 
	IRISH BORROWER:

	 	LIONBRIDGE INTERNATIONAL
	 

	 	

	
 
	 	(f/k/a LIONBRIDGE TECHNOLOGIES IRELAND),

a company organized under the laws of Ireland
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Director
	 
	 	 
	DUTCH BORROWERS:

	 	LIONBRIDGE TECHNOLOGIES HOLDINGS B.V.,
	 

	 	

	
 
	 	a company incorporated under the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS HOLDINGS

(NETHERLANDS) B.V., a company incorporated under

the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 
	US GUARANTORS:

	 	VERITEST, INC.,
	 

	 	

	
 
	 	a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	MENTORIX TECHNOLOGIES INC.,

a California corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE US, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS COMPANIES, INC. f/k/a BGS COMPANIES, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS FEDERAL, INC. f/k/a BOWNE GLOBAL SOLUTIONS FEDERAL, INC.,

a Delaware corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Director
	 
	 	 
	
 
	 	LIONBRIDGE GLOBAL SOLUTIONS II, INC. f/k/a BOWNE GLOBAL SOLUTIONS II, INC.,

a New York corporation
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: President
	 
	 	 
	FOREIGN GUARANTORS:

	 	LIONBRIDGE TECHNOLOGIES B.V.,
	 

	 	

	
 
	 	a company incorporated under the laws of The Netherlands
	 
	 	 
	
 
	 	By: s/Rory J. Cowan
	
 
	 	 
	
 
	 	Name: Rory J. Cowan

Title: Managing Director
	 
	 	 

2

Acknowledged, accepted and agreed:

WACHOVIA BANK, NATIONAL ASSOCIATION,

as Administrative Agent

By: s/Patricia S. Gaudreau

Name: Patricia S. Gaudreau

Title: Senior Vice President

3

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