WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.
For full, incremental, compressed and encrypted backups or archives
Powerful webdav client and sync tools with client-side AES encryption
The safest way to store private data in untrusted (cloud) environments
Robust and flexible VPN network tunnelling
57 Hash Functions In One Program, plus each with HMAC or KMAC
antigift is simple cross-platform, files & folders encryption tool
C++ cryptographic library (modern hash functions, ciphers, KDFs)
Multi hash crack suite
Checksum calculator and verifier tool
Send Mime and Smime Emails to Any Type of Mail Server
GILIB Large Integer Arithmetic Library
Comfortable hash-tool for texts and files
Secure mail + Tor gateway
A novel and uber-secure way to store data, by Ajay Menon
Hash: File Checksum Generator
Classic & Modern Cryptography tools