Entropy Zero - released as a Stand Alone (for free) on Steam, a "play as Combine" great mod (but with unfair difficulty, sometimes) with an amazing Grand Finale, where you play as a Metrocop in City 10, plagued with the "Combine flu".
Dark Interval - the "MOTY" IMHO, a dark and amazing take on the concepts of Beta HL2.
Aftermath - an interesting compilation of scrapped "Episode 3" concept's, the best experiment people can have about the (cancelled????) HL3/Episode 3.
Hunt the Cunt - GoldSrc mod still alive and kickin'.
Half Life :
YELLOW SHIFT- Not dead but STILL sloooooooowly developed. Don"t miss my yearly comment in 2018!
TIME'S END- Dev' told us 25 Aug 2017 "The first 20 maps are linked as of a couple of days ago. Loads more to go. I'm not going to set a release date, since I feel terrible for letting people down when I said "2015" on the trailer. But I am still working on it when I find the time."
THE CORE - updated regularly, but still no release date... At this point, I clearly don't know "when" and "if" it'll be relased.
THE VOLCANO- Last update in april 2016... and absolutly nothin' since that time.
MONORAIL QUEST - Beta-version is currently building!
HALF LIFE DELTA- maybe "end of the year" release?
CAT LIFE- still waiting after a more than 12 year long development (hell)... Currently on hold :/
BRUTAL HALF LIFE- Some updates showing us it's still alive. But no news about the next release.
Half Life 2 :
UNDERHELL CHAPTER 2- Dead for now :/ Moving on UE4....
OPERATION BLACK MESA/GUARD DUTY- Still updated, but "when it's done" for a release date...
LOST SQUAD- Indie project on Steam. When it's done...
GSTRING VERSION 2- When it's done... but we see the light at the end of the tunnel!!! Spring 2018?
CUBE -When it's done...
THE STARGATE MOD- Nearly finished... or not...