Table:
0
A
B
C
D
E
F
1
Editor
Site
Style, clone of
Cost ( US$ )
Open source
Activity
2
Ace (editor)
Home, demo
Sublime Text / Microsoft Visual Studio
Free
Yes
Yes
3
CodeMirror
Home, demo
plain textarea
Free
Yes
Yes
4
Orion
Home
Eclipse SWT StyledText, regular textarea
Free
Yes
Yes
5
Monaco Editor
example
Microsoft Visual Studio
used only by Microsoft
No
Yes
6
Markitup
Home, demo
Markup editor, no syntax highlight
Free
Yes
Some
7
LDT
Home
regular textarea
Free
Yes
Some
8
Ymacs
Home, demo
Emacs
Free
Yes
Some
9
CodePress
Home
Microsoft Visual Studio
Free
Yes
No
10
CodeTextArea
Home, demo
Microsoft Visual Studio
Free
Yes
No
11
EditArea
Home, demo
Microsoft Visual Studio
Free
Yes
No
12
Helene
Home [ dead link ] , demo [ dead link ]
Microsoft Visual Studio
Free
Yes
No
13
9ne
Home
Emacs
Free
Yes
No
14
jsvi
Home
vi
Free
Yes
No
15
MDK-Editor
Home
Microsoft Visual Studio
Depends on use
Code is readable
No

Questions and formulas:
Question: Which source has a Cost free, and an Activity of some, and an Editor of markitup?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(D1="free")*(F1="some")*(A1="markitup")),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,(D2:D15="free")*(F2:F15="some")*(A2:A15="markitup")),5))
Level: medium
Question: Which site has a Cost free and a Editor of jsvi?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,(D1="free")*(A1="jsvi")),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,(D2:D15="free")*(A2:A15="jsvi")),2))
Level: medium
Question: What is the cost of an Open Source that is no?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="no"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F15,E2:E15="no"),4))
Level: medium