Open-source code that enables you to use AES in CBC mode
Anubis Involutional 128-bit SPN Block cipher Encryption Tool
A bespoke symmetric cipher.
Encryption/Decryption tool for words/hash/digits/encoded text
A tiny, fast encryption tool in C
A family of small-state CSPRNGs and Stream Ciphers
A family of FLEA-inspired CSPRNGs and Stream Ciphers
SES brings back the uncrackable onetime pad, with a digital twist.
ISC lets you encrypt & decrypt text and files of any type up to 4GB
AES Encryption Program
JCryptor is an encrypting tool based on the Caesar-cipher.
A simple example of polyalphabetic cipher in Java.