**Exhibit 31.1**

Certifications

| I, Robert C. Shreve, Jr.,   certify that: |
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|                                      | 1. | I have reviewed this   quarterly report on Form 10-QSB of Avatar Systems Inc.; |
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|                                      | 2. | Based on my knowledge,   this quarterly report does not contain any untrue statement of a material   fact or omit to state a material fact necessary to make the statements made,   in light of the circumstances under which such statements were made, not   misleading with respect to the period covered by this quarterly report; |
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|                                      | 3. | Based on my knowledge, the   financial statements, and other financial information included in this   quarterly report, fairly present in all material respects the financial   condition, results of operations and cash flows of the registrant as of, and   for, the periods presented in this quarterly report; |
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|                                      | 4. | I am responsible for   establishing and maintaining disclosure controls and procedures (as defined   in Exchange Act Rule 13a-14 and 15d-14) for the registrant and I have: |

|   |   | a)     | designed such disclosure   controls and procedures to ensure that material information relating to the   registrant is made known to me by others within those entities, particularly   during the period in which this quarterly report was prepared; |
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|   |   | b)     | evaluated the   effectiveness of the registrant’s disclosure controls and procedures as of   September 30, 2005 and in this quarterly period presented in this report   (“Evaluation Date”); and                                        |
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|   |   | c)     | presented in this   quarterly report my conclusions about the effectiveness of the disclosure   controls and procedures based on the required evaluation as of the Evaluation   Date;                                                                  |

|   | 5. | I have disclosed, based on   my most recent evaluation, to the registrant’s independent registered public   accounting firm and the audit committee of the registrant’s board of directors   (or persons performing the equivalent function): |
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|                                     |   | a)     | all significant   deficiencies in the design or operation of internal controls which could   adversely affect the registrant’s ability to record, process, summarize and   report financial data and have identified for the registrant’s independent   registered public accounting firm any material weaknesses in internal   controls; and |
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|                                     |   | b)     | any fraud, whether or not   material, that involves management or other employees who have a significant   role in the registrant’s internal controls; and                                                                                                                                                                                         |
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| Date:   December 15, 2005 |

|   | /s/ Robert C. Shreve,   Jr.                      |
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|   |                                                       |
|   | Chief   Executive Officer and Chief Financial Officer |
|   | (principal executive and   accounting officer)        |

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