For full, incremental, compressed and encrypted backups or archives
UFONet - Denial of Service Toolkit
Chat Messenger. E-Mail-Client. Websearch. Filetransfer.
Powerful webdav client and sync tools with client-side AES encryption
Robust and flexible VPN network tunnelling
antigift is simple cross-platform, files & folders encryption tool
Centralized signing and verification
A modern, AI-Smart, WASTE p2p for ipv4 and invisible address spaces
GMR digital signature system
Open Source PKI solutions
SCSI Tape Encryption Manager
Secure mail + Tor gateway
CrococryptQuerl is a web-based file encryption & transfer tool
Encrypting, anonymous, unlimited size message transfer system
Easy to use GlobalPlatform tool (and a Java library)
ImpraStorage provided a private imap access to store large files
Ciphermail email encryption gateway (S/MIME, OpenPGP, PDF encryption)