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courierpasswd is an authentication and password changing utility that uses the courier-authlib authentication library to find user credentials. Its interface follows that of Daniel J. Bernstein's checkpassword program.

courieruserinfo is a utility for retrieving user account information. Account information is accessed through the courier-authlib authentication library.

Doscan is a tool to quickly scan your network for machines listening on a TCP port, opening thousands of TCP connections in parallel. Features High scanning rate: five to ten minutes per 100,000 addresses (which are sparsely populated with hosts), with rather conservative timeouts. Load distribution: doscan scans the addresses in a seemingly random order. If your scan host is connected to a central router, this ensures that the load is distributed across your network, and you are stress-testing just a single router, and not your edge devices. Low memory consumption: memory usage is proportional to the number of hosts which have responded so far, and to the number of parallel connections. The total number of addresses does not influence memory usage in any way. Can collect responses: doscan optionally records data which is sent by the hosts which are being scanned. You can even specify a regular expression to extract part of a server banner, and a message to send to trigger a response (great for determining HTTP server versions). Extensibility: It is possible to add special handlers for TCP-based protocols, using a straightforward interface. It supports scanning the vulnerable Microsoft DCOM implementation.

"Fragroute intercepts, modifies, and rewrites egress traffic destined for a specified host, implementing most of the attacks described in the Secure Networks "Insertion, Evasion, and Denial of Service: Eluding Network Intrusion Detection" paper of January 1998. It features a simple ruleset language to delay, duplicate, drop, fragment, overlap, print, reorder, segment, source-route, or otherwise monkey with all outbound packets destined for a target host, with minimal support for randomized or probabilistic behaviour. This tool was written in good faith to aid in the testing of network intrusion detection systems, firewalls, and basic TCP/IP stack behaviour. Please do not abuse this software."

GnuPG Made Easy (GPGME) is a C library designed to make access to GnuPG easier for applications. It provides a High-Level Crypto API for encryption, decryption, signing, signature verification and key management. Currently it uses GnuPG as its backend.

GPuTTY is a frontend to the SSH client, using the Gtk+ toolkit.

GNU SASL is an implementation of the Simple Authentication and Security Layer framework and a few common SASL mechanisms. SASL is used by network servers (e.g., IMAP, SMTP) to request authentication from clients, and in clients to authenticate against servers. GNU SASL contains a library (`libgsasl'), a command line utility (`gsasl') to access the library from the shell, and a manual. The library includes support for the SASL framework (with authentication functions and application data privacy and integrity functions) and at least partial support for the CRAM-MD5, EXTERNAL, GSSAPI, ANONYMOUS, PLAIN, SECURID, DIGEST-MD5, LOGIN, NTLM and KERBEROS_V5 mechanisms. The library is portable because it does not do network communication by itself, but rather leaves it up to the calling application. The library is flexible with regards to the authorization infrastructure used, as it utilizes callbacks into the application to decide whether an user is authorized or not.

GSS is an implementation of the Generic Security Service Application Program Interface (GSS-API). GSS-API is used by network servers (e.g., IMAP, SMTP) to provide security services, e.g., authenticate clients against servers. GSS consists of a library and a manual.

fsh -- Fast remote command execution The problem: logging in to a remote system with a cryptographic solution such as lsh or ssh takes time, due to the computationally expensive key exchanges that occur when the connection is established. It is common to trigger a lot of remote logins while using remote CVS, which makes it painfully slow compared to having the repository locally. The solution: reuse the secure tunnel once it has been established. fsh is a drop-in rsh-compatible replacement for ssh that automatically reuses ssh tunnels.

A command line idea encryption and decryption utility written by Dr. Richard De Moliner. IDEA (International Data Encryption Algorithm) is a block cipher devel- oped by Dr. Xuejia Lai and Prof. Dr. J. L. Massey at the Swiss Federal Institute of Technology.