Table:
0
A
B
C
D
E
1
Client
Windows
GNU/Linux
Mac OS X
Haiku
2
AirDC++
Yes
No
No
No
3
TkDC++
Yes
No
No
No
4
ApexDC++
Yes
No
No
No
5
DC++
Yes
No
No
No
6
EiskaltDC++
Yes
Yes
Yes
Yes
7
FlylinkDC++
Yes
No
No
No
8
LinuxDC++
No
Yes
No
No
9
RSX++
Yes
No
No
No
10
StrongDC++
Yes
No
No
No
11
Client
Windows
GNU/Linux
Mac OS X
Haiku

Questions and formulas:
Question: Which Mac OSX's GNU/Linux was yes when Windows was no?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(C1="yes")*(B1="no")),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,(C2:C11="yes")*(B2:B11="no")),4))
Level: medium
Question: Which Mac OSX had no haiku and a client that was dc++?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="no")*(A1="dc++")),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,(E2:E11="no")*(A2:A11="dc++")),4))
Level: medium
Question: Which GNU/Linux had no haiku and a client of airdc++?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(E1="no")*(A1="airdc++")),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,(E2:E11="no")*(A2:A11="airdc++")),3))
Level: medium
Question: Which client had no GNU/Linux?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="no"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E11,C2:C11="no"),1))
Level: medium