HL˛DM Pro is regular HL˛MP from VALVe with additional features that make the game faster and more addictive and fun to play. The Tau Canon aka Gauss, longjump pack, bunny hopping, wall jump, brightskin models and hitsound are part of it for instance. The mod features 13 gamemods (FFA, TDM, CTF, Fugitive, Arena, Instagib, ...) and includes GUI for both the players and the admins to control their playing environment or the match by itself (settings, start/pause/abort, ...).
was called Adrenaline Gamer and apparently it's still is. It's pretty bad. A lot of HL2MP pros tried it after HL2MP got ported to the Orange box (that killed bhop and trick jumping).
but with different Sourcemod plugins that fixes bhop and other shit made the pros come back.