ZABBIX is an enterprise-class distributed monitoring solution designed to monitor and track performance and availability of network servers, devices, and other IT resources. It supports distributed and Web-based monitoring, auto-discovery, real-time monitoring, SLA assurance, trending, and more.
Owl (Openwall GNU/*/Linux) is a small security-enhanced Linux distribution for servers. Owl also makes a good base system for customized virtual machine images and embedded systems, and Owl live CDs with remote SSH access are good for recovering or installing systems (whether with Owl or not). A single Owl CD includes the full live system, installable packages, the installer program, as well as full source code and the build environment capable of rebuilding the entire system from source. Owl supports multiple architectures (x86, x86-64, SPARC, and Alpha) and offers some compatibility for packages developed for other Linux distributions. The primary approaches to security are proactive source code review, privilege reduction, privilege separation, careful selection of third-party software, safe defaults, and "hardening" to reduce the likelihood of successful exploitation of security flaws.
FreeNIBS is a loadable plugin for the FreeRADIUS radius server. FreeNIBS provides authorization, authentication, and accounting for dial-in (PPP/PPPOE/PPTP) users. It can be used for real-time prepaid and postpaid billing. FreeNIBS can bill users based on service accuration, time, traffic, and both time and traffic. FreeNIBS has very flexible settings for groups, users, and prices. All data is stored in SQL databases such as MySQl, PgSQL, and Oracle.
Squid Account Management System (SAMS) is a Web-based interface and tool to manage users of a squid proxy server. It can manage users' access to squid, prohibition of users' to access to specific URLs, rewriting of requested URLs to graphical resources, and delay pools for user groups. It can save and build reports of users' statistics.