One of the biggest source ports, ZDoom, is no longer going to be updated. This is only for ZDoom, as projects such as GZDoom and QZDoom will be carrying the torch so to speak: http://forum.zdoom.org/viewtopic.php?t=54883

It's sad to see ZD go. Sure by now GZDoom was making more updates happen, but to me ZD always felt like that solid port I could always rely on. Rain or shine, toaster or big gaming rig.

While I'm sad that ZDoom is dead, I've been waiting for that development a long time. Almost all recent changes to ZDoom have been made by Graf, and he's always been uncomfortable with changes to the software renderer.

With his focus solely on GZDoom and without the burden to keep ZDoom in sync we'll probably see more improvements of important stuff e.g. ZScript and portals.

This has been in the cards for some time; GZ doom has become the new standard.