2017-03-03 (updated 2020-03-09)
On the game being vaporware: Between 2009 and 2010 the developers ceased to publish notable new information until suddenly resurfacing and releasing part of the game.

2012-09-14 Black Mesa: Source was released, after which the project went on another hiatus and limited communication.
2020-03-06 The final game was released, no longer free and instead fully commercial project.