Cacti is a complete network graphing solution designed to harness the power of RRDTool’s data storage and graphing functionality. Cacti provides a fast poller, advanced graph templating, multiple data acquisition methods, and user management features out of the box. All of this is wrapped in an intuitive, easy to use interface that makes sense for
LAN-sized installations up to complex networks with hundreds of devices.

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MySQLTuner is a script written in Perl that will assist you with your MySQL configuration and make recommendations for increased performance and stability. Within seconds, it will display statistics about your MySQL installation and the areas where it can be improved.

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Feature Extraction Service for Multimedia Analysis and Retrieval System automatically classifies the visual contents of images using powerful, computer-based technologies. Feature Extraction Service uses the semantic annotation capabilities of Multimedia Analysis and Retrieval System and exposes its core image classification functionality as an online, real-time service interface.

Security is an important issue when installing a bundle of new features to software. Learn about signature technologies used by the Eclipse platform to determine the trustworthiness of plug-ins. Eclipse places each plug-in into one of five categories: unsigned or signed, trusted or untrusted, or expired. Learn how to create signed plug-ins in Eclipse and IBM Lotus Expeditor, an Eclipse-based product.

This tutorial explains how you can set up MySQL master-master replication on four MySQL nodes (running on Debian Etch). The difference to a two node master-master replication is that if you have more than two nodes, the replication goes in a circle, i.e., with four nodes, the replication goes from node1 to node2, from node2 to node3, from node3 to node4, and from node4 to node1.

http://www.howtoforge.com/setting-up-master-master-replication-on-four-nodes-with-mysql-5-on-debian-etch