As a Ruby developer its sometimes hard to know if a particular Gem is still being actively maintained or if there is a better, more recent alternative. I find that Github does an outstanding job solving both problems. If there haven't been commits in the last year (6 months?) I'll generally look elsewhere. That elsewhere is generally the "Network" page. :)
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edit: Actually, my window manager of choice has basically been abandoned by its developer several years ago, and it's still bug-free, stable, and lacking basically nothing. I finally came up with a feature enhancement I'd like it to have today, after using it for five years with no complaints or wants -- and that enhancement is really just an improvement of an existing feature.
More to the point, it's an enhancement that no window manager has, so I'm likely to need to write the code for this feature enhancement myself if I want it badly enough. I may pick up maintainership for the project to do just that.
Think about that a moment: one feature enhancement requested in have a decade, merely an extension of an already existing feature, and it's something entirely new to window managers as far as I'm aware. This thing has had no need for additional code in all that time, and it has been better as a result of all that.