The Tiny SRP library is a stripped-down version of srp-1.7.1 and openssl-0.9.6 that contains only what is necessary for secure remote passphrase authentication. No other libraries are required. If you already have libsrp installed on both server and client then you don't need this. Tiny SRP is designed for embedded or mini distributions, and is also a quick and easy way to add secure authentication to small client/server projects. Also included is the TSRP protocol, which reduces socket authentication to one function call on each of the client and server.
The Toby intrusion detection system is a fairly complete reimplementation of tripwire-1.3 (ASR) into Perl. It mainains a database of file properties to detect alterations to those properties. It supports MD5 and SHA-1 checksums of the file contents. It features a configuration file which is actually a Perl script, with the attendant power, flexibility, and difficulty.
trf is an extension library to the script language tcl, as created by John Ousterhout. It extends the language at the C-level with so-called "transformer"-procedures. With the help of some patches to the core the package is able to intercept all read/write operations on designated channels, thus giving it the ability to transform the buffer contents as desired. Existing transforms include Base64, UUencode, Hashes (SHA, MD5, ...), error correction codec, zlib-based compression, script level transforms.
TrinityOS is a step-by-step, example-driven HOWTO on building a very functional Linux box with strong security in mind. TrinityOS is well known for its strong packet firewall ruleset, Chrooted and Split DNS (v9 and v8), secured Sendmail (8.x), Linux PPTP, Serial consoles and Reverse TELNET, DHCPd, SSHd, UPSes, system performance tuning, the automated TrinityOS-Security implementation scripts, and much more.
Trinux is a minimal Linux distribution that boots from a single floppy or CD-ROM, loads its packages from an FTP/HTTP server, IDE filesystem, or additional floppies, and runs entirely in RAM. It contains the most comprehensive set of network security tools available in any Linux distribution and can be used to conduct security research, analyze network traffic, and perform vulnerability testing of networks and applications.