Progress Update! I am proud to announce that Beta 2.2 is coming along very nice, stable and fairly quickly.
A bunch of new things have been added too. For one, the Level Class System has been implemented and fully completed; level authors can create their own classes for their maps. This should really improve upon cooperative play.
We have also added some new NPCs, familiar to those that have played the original Half-Life game. They are: Human Female Assassin, Gargantua, Alien Grunt, Houndeye and Panthry.
There is also more information and update news on the main page, along with a complete Changelog, come take a look at Synergymod.com