Web browsers

Tor Browser, Firefox

Text message replacements (cross-platform, secure)

Signal, Wire, Telegram

Direct file transfer (secure, no cloud)

OnionShare, Datash, SendSecure, JustBeamIt, ToffeeShare

File Transfer (local network only, no cloud),

File Transfer (secure, temporary cloud)

Tresorit Send, WeTransfer, UploadFiles, FileMail

File sync (no cloud)


Password management (no cloud)

KeePassXC (hint: combine with SyncThing)

Full Cloud
(e.g. google/icloud alternative: email, contacts, calendar, files, etc.)

Disroot, Zoho

File Sharing, Chat, Team Collaboration
(e.g. Slack alternative: private, secure, with cloud)


Secure Email


VPN (Virtual Private Network)

ProtonVPN (free & paid), NordVPN (paid & good)

Free Office Suite (Microsoft Office Alternative)

LibreOffice (better MS compatibility), OpenOffice


More free and open source source software

14 Best Free And Open Source Software For Windows 2018

Open Source Mac

Open Source Windows

11 Best Open-Source Software 2019