Table:
0
A
B
C
D
E
1
Name
Actual version
System
Platform
License
2
MESS
0.147
Various computers and consoles
Cross-platform
Custom
3
6502Em
4.00
BBC Micro , BBC Master , Acorn Electron
Windows , RISC OS
Commercial
4
ElectrEm for Windows, DOS, UNIX/Linux and Mac OS X
0.6c
Acorn Electron
Windows , OS X
Open source
5
Elkulator
1.0
Acorn Electron
Windows , DOS , Linux
GPL
6
ElkJS
n/a
Acorn Electron
Cross-platform
Open source

Questions and formulas:
Question: What is the name of the platform used for various computers and consoles?
Formula: FILTER(D1,C1="various computers and consoles")
Formula2: FILTER(D2:D6,C2:C6="various computers and consoles")
Level: easy
Question: Which system is named ELKJS?
Formula: FILTER(C1,A1="elkjs")
Formula2: FILTER(C2:C6,A2:A6="elkjs")
Level: easy
Question: What is the system called that is named ELKJS?
Formula: FILTER(C1,A1="elkjs")
Formula2: FILTER(C2:C6,A2:A6="elkjs")
Level: easy