- 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
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.
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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.