sud (superuser daemon) permits a user to switch to root privileges and to use a suid program in a nosuid environment. It is based on a client/server model and on the ability to pass file descriptors between processes. sud permits you to choose your authentication method, and your effective credentials will be checked by using a Unix domain socket.
SWISH stands for Simple Web Indexing System for Humans. With it you can index directories of files and search the generated indexes. Based on EIT's swish, this is a cleaner-compiling, enhanced version with better docs, better installation and configuration tools, more sample configurations, and a Web page to help manage index rebuilding. SWISH is used with w4ais as a Web-based front end.
syren is a CLI file downloader somewhat similar to wget and aria2c. It features support for HTTP, HTTPS, and FTP, resumable downloads, HTTP proxy support (including CONNECT mode for HTTPS), LISP scripting support, a small reusable downloader library, a small, reusable, and fast LISP interpreter library, predictable console output suitable for parsing by frontends, cookie support, easy changing of UserAgent and Referer fields, POST method support, and more.
syslog-ng is a syslogd replacement for a wide variety of UNIX systems that supports IPv6 and is capable of transferring log messages reliably using TCP and SSL and filtering the content of messages using regular expressions. Both RFC3164 and RFC5424 style messages are handled, but more esoteric formats like BSD process accounting logs are supported too. Apart from regular text files, it supports storing messages into SQL and MongoDB databases, and forward messages to local processes via pipes or UNIX domain sockets. This makes syslog-ng ideal as an integration platform. syslog-ng supports extracting structured information from the traditionally text based syslog via csv-parser(), db-parser(), and patterndb. Tag based classification, rewriting messages, and outputting messages in JSON is also possible. This makes syslog-ng ideal for preprocessing events for further analysis, be that home-grown scripts or SIEM systems. syslog-ng scales well on today's multi processor and multi-core systems: reaching 1,000,000 messages per second is a reality for the simplest use cases.
tcpdump prints a description of the contents of packets on a network interface which match a given boolean expression. It can also be run with the -w flag, which causes it to save the packet data to a file for later analysis, and/or with the -r flag, which causes it to read from a saved packet file rather than to read packets from a network interface. In all cases, only packets which match the expression will be processed by tcpdump. tcpdump logs more than just TCP, IP, or ethernet packets, but has a whole suite of decoders, including ones for USB.
Tdbengine is an RDBMS with an integrated programming language. It represents the enhancement of the famous DOS-TDB, and is designed to handle databases on the Web. It connects to the Web server using the standard CGI interface, or runs on the command line. It is very small (about 400 KBytes), extremely quick, and easy to administrate. Its features are full text indexing, an automatic data link system, and the script language EASY, which replaces the commonly used SQL with its modular code.
teepeedee is a small, fast, single-threaded file server. It is very scalable, and can serve multiple files over HTTPS, HTTP and FTP simultaneously, listening on any number of ports and providing entirely different views of the filesystem to different users. It supports most of the draft-ietf-ftpext-mlst-16.txt FTP extensions, as well as EPRT, EPSV, AUTH TLS, and HTTP 1.1 persistent connections.