BitBar
BitBar: the free app that lets you put the anything into your Mac OS X menu bar. Browse from a wide range of plugins, or easily write your own (using any language you like).
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Alternatives to BitBar
Conky
Free
Light-weight system monitor for X. Contribute to brndnmtthws/conky development by creating an account on GitHub.
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GKrellM
Free
GKrellM is a single process stack of system monitors which supports applying themes to match its appearance to your window manager, Gtk, or any other theme. To subscribe/unsubscribe to the GKrellM
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Activity Monitor
Free
MacOS Mojave brings new features inspired by its most powerful users, but designed for everyone to the Mac.
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Rainmeter
Free
Rainmeter is software that allows users to customize their Windows desktop. This application makes it possible for individuals to add useful information in the form of widgets. There are also
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IStat Menus
Paid
IStat Menus is an advanced system monitor created to monitor your Mac. The goal of iStat Menus is to create customizable notifications, menu bars, and monitors to suit each individual Mac user's
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