There's so many it's hard to just choose a few, but Tweedle is another good one even if it hasn't been updated in forever. Or even Tweetings. We don't have enough time to talk about them all.
Tweedle is very fast, efficient, and another minimalistic app that still has tons of options, features and customization. Being able to rapidly change the look and feel, yet still be fast and fully working, makes it great.
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