The Science and Industry page has the debut version 0.94 of the Science and Industry mod for Half-Life. While this initial release only contains one map, a second map is expected, perhaps as soon as tomorrow, and there is also a map kit in their maps section to encourage others to design more maps, which they are soliciting for inclusion in version 1.0. The manual for the mod is online to give a comprehensive look at this mod, and here's a short description to start on:

Science and Industry is a teamplay mod for Half-Life, in which players assume the role of Security Officer at one of two rival corporations striving for domination in the cutthroat world of chemical and weapons research and development. The player's job is to protect and acquire scientists, who develop weapons to use against the other corporation. The more scientists a team has the faster they'll make new discoveries, but the only way to get new scientists is by kidnapping them from the competition. Science & Industry features interaction with NPC's in multiplayer, new weapons, and a bunch of new gameplay features.