This is a list of the best free and open source software alternatives for security and privacy. The list is divided into categories and subcategories. The software is listed alphabetically within each category. The list includes software for all major operating systems (Windows, macOS, Linux, Android, iOS) and is updated regularly. Sometimes there are also Not Open Source (NOS) software, but they are indicated as such (Beeing NOS does not mean that the software is bad, but it is recommended for security and/or privacy reasons).
Feel free to contribute to the list!
NOS = Not Open Source
AI #
Authenticators #
- 2FAS Auth - iOS / Android
- AndOPT - Android
- Authy - NOS
- Bitwarden - Paid version
- Ente Auth
- FreeOPT
- Proton Pass - Paid version
Browsers #
Calendar #
- Etar
- Gnome Calendar
- Kalendar
- Lightning Calendar
- Mailbox
- Nextcloud Calendar
- Posteo
- Proton Calendar
- Tuta
Cloud and Sync #
Code Editors #
- Atom - Discontinued
- CodeSandbox
- Cosmic - TBA
- Eclipse IDE
- Expo.dev
- Kate
- Neovim
- Pulsar - Atom Fork
- PyCharm
- Vim
- VSCodium
Digital Audio Workstation #
E-mails #
Gaming #
Image editors #
Maps #
- OsmAnd - iOS / Android
- OpenStreetMap
Media Servers #
Messaging apps #
Mind-mapping #
Office #
PDF #
Password Managers #
Research Related Software #
Search engines #
To-do and notes #
- AppFlowy - Notion Alternative
- CherryTree
- Joplin
- OpenProject
- QOwnNotes
- Simplenote
- Standard Notes
- Zettlr
Torrent Clients #
UML #
VPN #
I suggest checking out Techlore’s VPN Toolkit for more details on VPNs.
Video editors #
Readers RSS #
This list is under construction!