HElib is an open-source software library that implements homomorphic encryption. It supports the BGV scheme with bootstrapping and the Approximate Number CKKS scheme. HElib also includes optimizations for efficient homomorphic evaluation, focusing on effective use of ciphertext packing techniques and on the Gentry-Halevi-Smart optimizations.
A simple C# code library that makes encrypting blocks of data easier. Data blocks are encrypted using AES but also have HMAC integrity built in to guard against data tampering or corruption. This library is designed to be very easy to use.
Kryptel and Silver Key encryption engine. In addition to basic cryptographic functions the library implements high-level encrypted storage (both generic and file-oriented variations) for secure storage and backup, and encrypted parcels for secure file exchange.