Open Source PKI solutions
OpenSC - tools and libraries for smart cards
Decrypt encryptions without knowing the key or cipher
A cryptographically verifiable code review system for the cargo
A modern, portable, easy to use crypto library
High-level cryptography interface powered by libsodium
Amazon DynamoDB Encryption Client for Python
Simple but Powerful, Cross-Platform Password Management Utility
Smoke: Android Crypto Chat Messenger
Open-source implementation of a substantial portion of the API