- as slim as GhostWall(*) (implementing trivial allow/disallow rules based on port/protocol/direction)
- preferably, with a GUI
- open source
- supported (not abandoned some years ago)
(*) -- which looks like this:
closed as not a real question by nhinkle♦ Mar 14 '12 at 18:02
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Firewall PAPI is a lightweight (setup file=276 KB) open source firewall for Windows.
Core Force is a free open source comprehensive endpoint security solution for Windows systems. Its setup file is 19.6 MB.
You may check this page for more alternatives.