RuckusRD is a drop-in replacement for mkinitrd that's intended for use on embedded systems or removable media (e.g. live CDs), but is also perfectly usable on normal desktop Linux systems. Its main strength is its non-memory-retentive read-write root filesystem support, which combines a read-only SquashFS image with a RAM overlay. This utility is part of the Source Ruckus project.
Ixmon is a terminal based reader and monitor for RSS, Atom, YouTube, Vine, Instragram, Twitter, Gmail, weather, stocks, cryptocurrency, and more. Hundreds of data sources can be comfortably tracked and special syntax URLs such as stock://AAPL or coin://bitcoin allow you to extend the capabilities of RSS and put all this data in an interface you can search or quickly navigate through using VIM-style keyboard shortcuts. Items can be sorted by time or media type and network resources are conserved by using an exponential decay polling algorithm.
GroupOffice is a groupware suite that takes your office online, implementing online collaboration and CRM. It allows you to share projects, calendars, files and email online with co-workers and clients. It is easy to use and fully customizable. It also features synchronization with PDAs and Outlook.
fio is an I/O tool meant to be used both for benchmark and stress/hardware verification. It has support for 13 different types of I/O engines (sync, mmap, libaio, posixaio, SG v3, splice, null, network, syslet, guasi, solarisaio, and more), I/O priorities (for newer Linux kernels), rate I/O, forked or threaded jobs, and much more. It can work on block devices as well as files. fio accepts job descriptions in a simple-to-understand text format. Several example job files are included. fio displays all sorts of I/O performance information, including complete IO latencies and percentiles. Fio is in wide use in many places, for both benchmarking, QA, and verification purposes. It supports Linux, FreeBSD, NetBSD, OS X, OpenSolaris, AIX, HP-UX, and Windows.
BalanceNG is a modern, IPv6 capable software IP load balancing solution. It is small, fast, and easy to use and set up. It offers session persistence, different distribution methods (Round Robin, Random, Weighted Random, Least Session, Least Bandwidth, Hash, Agent, and Randomized Agent) and a customizable UDP health check agent in source code. It supports VRRP to set up high availability configurations on multiple nodes. It supports SNMP, integrating the BALANCENG-MIB with Net-SNMPD. It implements a very fast in-memory IP-to-location database, allowing powerful location-based server load-balancing.
Suricata is an Intrusion Detection and Prevention (IDS/IPS) engine developed by the Open Information Security Foundation and its supporting vendors. The engine is multi-threaded and has native IPv6 support, file extraction capabilities, and many more features. It's capable of loading existing Snort rules and signatures, and supports many frontends through Barnyard2.