GnuTLS is a secure communications library implementing the SSL, TLS, and DTLS protocols and technologies around them. It provides a simple C language application programming interface (API) to access the secure communications protocols, as well as APIs to parse and write X.509, PKCS #12, OpenPGP, and other required structures. It is intended to be portable and efficient with a focus on security and interoperability.
Gpasman is a password manager. People working with the internet have to remember lots of passwords. Saving them in a textfile is not a secure idea. Gpasman is a GTK solution to this problem since it saves the password information encrypted, so now you have to remember only one password instead of ten (or more).
Griffon is a GTK+ GUI cryptanalysis tools package for pre-digital ciphers. All monoalphabetic transposistion and substitution ciphers are covered, including multi-char ciphers such as Playfair. The toolset includes a customizable frequency count, substitution list, cribbing of ciphers, and a notepad to record your attempts.
iSSL (independant Secure Sockets Layer) is a minimalistic cryptographical API that uses the RSA and AES ciphers to establish SSL-alike, secure encrypted communications between two peers communicating through a network socket, including session key generation and public key exchange.
John the Ripper is a fast password cracker, currently available for many flavors of Unix, Windows, DOS, BeOS, and OpenVMS. Its primary purpose is to detect weak Unix passwords. It supports several crypt(3) password hash types commonly found on Unix systems, as well as Windows LM hashes. On top of this, lots of other hashes and ciphers are added in the community-enhanced version (-jumbo), and some are added in John the Ripper Pro.
Keep in Touch aims to be a secure IM system for multiple platforms. It supports its own XML-based protocol as well as ICQ and AIM (toc). It provides encrypted connections between the server and client aswell as encrypted chat on all supported networks. The client can store contacts on the server allowing users to keep their contact lists between different locations.