Here are a few that I like. A good google search should lead you to a download site for any of these.
For Windows:
Zmud (Tons of features)
Gmud (Light but useable)
For Linux:
Kmud (Has a nice mapper)
TinTin++ (Standard issue)
Multiplatform (Windows, Linux, and MacOSX):
Ggmud (A SClient / TinTin++ hybrid)
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