EGN - 709 

EGN (Enternet Global Network) is an easy-to-use gaming network that takes you through a step-by-step account setup wizard, and provides a small, simple, graphics-intense interface. EGN also features a very useful chat client which allows you to keep a list and talk with your buddies before launching an online game. EGN also lets you customize the appearance by allowing you to select from included skins, or to even make your own! It has half-life support.

Kali - 1.99d 

Kali is a state-of-the-art TSR program that allows people who use SLIP/PPP accounts, Ethernet connections, T1 lines, or ISDN lines to play IPX network-compatible games across the Internet. With Kali, users with Win95/NT, DOS, Mac and OS/2 user can participate in the same multi-player game! Now, Kali has compression support, the ability to disable the Windows keys on your keyboard, 200,000+ players, 600+ servers, 65 countries, 100+ games, free software updates, and many more nice features.