Alle open source menu bar apps.

Thanks to Background Music, you can automatically pause your music, set individual apps’ volumes and record system audio. Background Music can even pause your music player app when other audio starts playing. The idea is that when you’re listening to music and pause it to watch a video you always forget to unpause it.
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Use Thyme to keep a record on how much time you spend on your tasks such as work or study, as well as anything else that requires a timer.
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BeardedSpice allows you to control web-based media players and some native apps (including iTunes, Spotify, VLC, Vox, and Downcast) with the media keys found on Mac keyboards. In other words: It wrests control of your media keys from iTunes and hands it back to you.
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Simple menu bar weather app for macOS. An icon (that supports both dark and light theme) represents the current weather. You can choose your location by gps or zipcode.
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Tomighty is a menu bar timer specifically designed for the Pomodoro Technique.
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