what is necessary for me to play BMS?

Black Mesa Archive Help!
#1

Hello to you all, I would like to know which programs are necessary for the Black Mesa Source can run without problem, only the programs that you use that are using it

#2

There’s a wiki and FAQ for this.
Steam.
Source SDK 2007 Base (Tools tab under Library in Steam)
That’s it.

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.