Checkservice is a Perl script that monitors services on remote hosts. It uses plugins to provide a more thorough check than just a socket check, and can be configured to check multiple services on multiple hosts using two different methods (simple and extended). It is able to write logs and when running in the background enables warnings. It features a beep-, mail-, and SMS-warning system.
DB_eSession is a feature-packed PHP class that stores session data in a MySQL database rather than files. It is powerful, designed with security in mind, and is easy to utilize. The code contains lots of comments, and it comes with full documentation and examples of how to use the class including a basic authentication login/logout process. It includes member functions useful (to webmasters) for monitoring or viewing, deleting, and altering sessions validity for the case of locking one or more sessions upon detection of unauthorized use.
Expresso Framework is an open standards-based J2EE architectural framework that allows the developer to concentrate on application logic. It is a library of extensible Java Server application framework components for creating database-driven Web applications based on open standards. Expresso integrates with Apache Jakarta Struts, which emphasizes presentation and application configuration, and bringing a powerful tag library to Expresso. Expresso adds capabilities for security, robust object-relational mapping, background job handling and scheduling, self-tests, logging integration, automated table manipulation, database connection pooling, email connectivity, event notification, error handling, caching, internationalization, XML automation, testing, registration objects, configuration management, workflow, automatic database maintenance, and a JSP tag library.
Furies is a Java-based Web site testing tool which relies on many Jakarta components. Its goal is to ensure a Web page is "correct" by running one or more conditions on it. The Furies distribution supplies some conditions and it is very easy to program your own. For accessing Web sites, Furies relies on HttpClient and configuration may be done programmatically or via Digester.
IP Traffic Volume uses Linux kernel iptables to log incoming and outgoing bytes though your network device(s) and can dump summarized log statistics in ASCII to the console or display in HTML via the included CGI interface for displaying on a Web server. It is highly configurable as to what kind of traffic is counted, e.g. to and from specific ports and/or specific IP addresses or groups of ports and addresses. It uses a mininum of resources and doesn't need a database for the logged data.