Hotlist
Searching in vain for a simple yet effective list management app on Mac? Try Hotlist. It is a handy task and task list manager that, after installation, settles in the form of an inconspicuous icon in the menu bar at the top of your Mac screen - from here you can conveniently manage everything you need. It is an open-source application to which you can add your own plugins.
Macy
If you often work with the clipboard and its contents on your Mac, you will definitely appreciate an application called Maccy. Maccy is a really great clipboard manager for your Mac that's fast, respects your privacy needs, is open source, and last but not least, it also offers hotkey support.
expanded
Are you not comfortable with the native text replacement on your Mac for various reasons? Try the Espanso app. It is a useful tool in which you can create templates of words and whole sentences, saving you time and effort when typing. You can assign keyboard shortcuts to individual expressions, and if you accidentally forget them, nothing happens at all - Espanso offers its own smart help.
syncthing
Syncthing is a program for continuous file synchronization. Synchronizes files between two or more computers in real time, securely protected from prying eyes. If you want to be sure that your data will be shared with the utmost respect for your privacy and security, you can rely on Syncthing 100%.
flashbang
Are you looking for a simple but reliable application for creating flashcards? You can try Flashbang, a free application that, in addition to creating and viewing flashcards itself, also offers their import and multiple viewing modes.