WinSCP is a free SFTP, SCP, S3, WebDAV, and FTP client for Windows.
For full, incremental, compressed and encrypted backups or archives
57 Hash Functions In One Program, plus each with HMAC or KMAC
C++ cryptographic library (modern hash functions, ciphers, KDFs)
Send Mime and Smime Emails to Any Type of Mail Server
Checksum calculator and verifier tool
Comfortable hash-tool for texts and files
Protect and Obfuscate Encode PHP File From reading ( Opensource )
EFT simulator
Set of useful tools for payment service development