What about OP: S and BS: S?

First off all, I’m not talking about a total conversion.
Like HL: S, is it possible to convert original BS and OP files to Source Engine?

gearbox
release anything useful for modders

No point of doing that only for ragdoll physics and better effects
Thats why there are total conversion mods

Well, I asked it because I wanted to add subtitles (and probably translation to my language).

Founded in 2004, Leakfree.org became one of the first online communities dedicated to Valve’s Source engine development. It is more famously known for the formation of Black Mesa: Source under the 'Leakfree Modification Team' handle in September 2004.