Cross-Platform Apps

Productivity

• calendar: OneCalendar / Proton Calendar

OneCalendar is closed-source whereas Proton Calendar is open-source. Proton Calendar requires using Proton Mail, however. If you don’t like either, I would recommend the Android and iOS specific calendar apps.

• notes: Joplin / Obsidian / Logseq / Notesnook / others

Joplin, Logseq, and Notesnook are open-source whereas Obsidian is closed. All of them offer syncing options. Logseq interestingly doesn’t use a folder-based structure like Obsidian does, but both use .md files.

Joplin and Notesnook don’t use .md files or similar, but the latter allows you to export your notes as text files (.txt, .pdf, .html, and .md). There is a Joplin plugin that allows you to save notes as .md files called “Save as .md”. This feature should really be built in though.

Other note-taking apps are also great, it just depends on your personal preference. The ones I have listed here are options that I have tried that have good UI, syncing between devices, and Markdown support in some form or another.

• handwriting notes: Saber

Stylus Lab Write is a good alternative, but is not open-source.

• office suite: Collabora Office

Social

• Mastodon: official app
• Lemmy: Voyager
• Matrix: FluffyChat

Navigation

• maps
  • standard: Organic Maps / CoMaps
  • more features: OsmAnd

Magic Earth is another popular option with many features, but is not FOSS.

CoMaps is a community-driver fork of Organic Maps as the latter was not transparent about some decisions and

• public transport: Transit

Utilities

• file sharing: KDE Connect / LocalSend
• screen mirroring and extending: spacedesk

Other

• weather: Carrot Weather / Hello Weather
• podcasts: Pocket Casts / Podcast Republic