Are Half-Life and CS the only supprorters for ESF?

Can you use other games to support ESF or do i need Counterstrike? please help!
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Im like 100% sure you must have half-life or counterstrike, since thats the engine it was made for, correct me if im wrong.

what other game would u use... its a half life mod. are you gona use starcraft to play?

HL and CS work for sure ... i heard also that DOD can work too, but im not sure of that, corect me if im wrong ... and Pain, we are talking about sierra HL game, and not of blizzard and co. game ...

im fully aware of this which is why i said
"what other game would u use... its a half life mod."
in the first place