fio is an I/O tool meant to be used both for benchmark and stress/hardware verification. It has support for 19 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, OpenBSD, OS X, OpenSolaris, AIX, HP-UX, Android, and Windows.
NetXMS is a network monitoring and management system with a modular architecture. It can be used for monitoring an entire IT infrastructure, starting with SNMP-capable hardware (like switches and routers) and ending with applications on servers. The system has a three-tier architecture; the information is collected by monitoring agents (either its own agents or SNMP agents) and delivered to the monitoring server for processing and storing, where it can be accessed by using the management console. It features centralized configuration and centralized agent upgrades.
The GNU Gatekeeper is a free H.323 gatekeeper based on the OpenH323 project. You can use it to manage a Voice-over-IP network and let endpoints (e.g., Netmeeting) communicate through symbolic names. It also has an external interface for billing and other applications. It runs on a number of Unix versions (including Linux and Solaris) and Windows.
netconf is a tool designed to replace Debian's ifupdown in a backwards-compatible manner while aiming for maximum extensibility and flexibility. While it can read existing interfaces files and execute hooks in much the same way, it ties in closer with aspects of network configuration that have become more and more important in the past decade: link and location autodetection, including a framework to configure printers, smarthosts, proxies, etc.; zeroconf; wireless LAN configuration; VPN; firewalling; advanced routing and traffic control; and more.
curl-loader is a powerful tool for testing and generating load for Web applications. It uses HTTP, FTP, and TLS/SSL stacks. The loader simulates tens and hundreds of thousands of users or clients, each optionally with its own IP address. The goal is to provide an alternative to the Spirent Avalanche and Ixia IxLoad Web application testing solutions.
UidSEC is an LSM (Linux Security Module) that extends the standard UN*X "resource protection" model by adding some features useful for untrusted multiuser systems. It can deny usage of dmesg to unprivileged users, hide processes of "other users" to unprivileged users, deny access to /sys and /config to unprivileged users, and protect usage of the bind() syscall using UidBIND.