
JabRef
Mendeley
Zotero
Qiqqa
Citavi
Docear
Paperpile
EndNote
Loop Habit Tracker
Habitica
Habitify
Streaks
HabitKit - Habit Tracker
HabitBull
everyday.app
Everyday
I guess it's really safe cause it's open source, you can make notes on your habits but don't really do that. Its simple. Really fast. Haven't found a way to connect it to notion. In general it's a great app to track you habits. Does its job. Not more, not less.
Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
Habitica - Habitica is a free habit building and productivity application.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Habitify - The easiest way to keep track of your habits
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Streaks - The to-do list that helps you form good habits.