Free highly configurable software for linux

Simple utility that turns your monitor into a configurable strobe light.

Source code is included alongside the executable "strobelight" in the archive.

ROX Filer is a fast and powerful graphical file manager.

It has full drag-and-drop support and background file operations, and is highly configurable.

phpInv is a small yet highly configurable inventory script written in PHP with a MySQL backend. Its features unlimited categories, unlimited depth of sub-categories, customizable columns per category, an administration control panel, access permissions (user and group), easy configuration, a template system, and searching.

protosquared project offers a "data server prototype".

You can supply a rule set by which incoming requests are handled. It will support several data sources, such as XML files and SQL databases.

It is aimed at being highly configurable.

Guifications is a Gaim plugin that displays msn style "toaster" popups in a user defined corner of the screen.

Guifications is highly configurable, and easy to use. There are a ton of preferences, that may be daunting at first, but are pretty straight forward.

YAZ Proxy application is highly configurable and can be used in a number of different applications, ranging from debugging Z39.50-based applications and protecting overworked servers, to improving the performance of stateless WWW/Z39.50 gateways.
Main features:
- Configurable logging
- SRU/SRW server function, to allow any Z39.50 server to also support the ZiNG protocols
- Load balancing across multiple backend servers
- Session-sharing and pre-initialization to improve performance in servers with expensive session initialization
- Configurable request filtering, to keep bad requests from reaching the server
- XML support -- MARC records can be converted to MARCXML, and XSLT-transformations allow the proxy to support arbitrary retrieval schemas in XML
- Load governor function limits requests from aggressive batch-mode clients
- Efficient multiplexing software enables small memory footprint and very high performance
NOTE: The YAZ Proxy, a complete application, is available under the GPL license. Other licensing terms are available to commercial vendors upon request.

Mail Avenger is a highly-configurable, MTA-independent SMTP server daemon. Mail Avenger lets users run messages through filters like ClamAV and SpamAssassin during SMTP transactions, so the server can reject mail before assuming responsibility for its delivery.
Other unique features include TCP SYN fingerprint and network route recording, verification of sender addresses through SMTP callbacks, SPF (sender policy framework) as a general policy language, qmail-style control over both SMTP-level behavior and local delivery of extension addresses, mail-bomb protection, integration with kernel firewalls, and more.
Enhancements:
- Several minor bugs were fixed.
- The SMTPCB configuration directive was changed to give more options.
- An InsecureSASL configuration option was added by request of users.

SnortSMS is a highly configurable sensor management system that provides the ability to remotely administer Snort [and Barnyard] based Intrusion Detection Systems (IDS), push configuration files, add/edit rules, and monitor system health and statistics, all from a simple and clean Web interface console.
Whether you have one or multiple Snort sensors, SnortSMS can help unify and syncronize all sensor configurations.
Main features:
- Centralized Sensor Management - Unify all sensors under one common console interface. Create and share global configuration policies throughout your IDS sensors. Remotely start and stop sensors.
- Barnyard Support - Integrated support for Barnyard including auto-generation of sid-msg.map.
- Health Monitoring - Monitor the statistics and health of all your sensors. Our parallel querying engine retrives vital stats from all sensors simustainiously.
- Configuration Verification - Uses MD5 checksums to validate sensor config policies with global configuration settings.
- Rule Importing - Instantly download and import Snort rules and configuration resources into the SnortSMS libraries.
Enhancements:
- This release adds support to handle Dynamic directives.
- There are miscellaneous bugfixes.