GNU Mailman is software to help manage email discussion lists and e-newsletters. Its integrated Web interface provides easy-to-use access for list members and list administrators. Mailman supports built-in archiving, automatic bounce processing, content filtering, digest delivery, spam filters, topics, Usenet gateways, and more. It is fully internationalized, and supports digests and email commands. It runs on any Linux or Unix-like operating system and is compatible with most email and Web servers, mail readers, and Web browsers....

Apache ActiveMQ is a fast Message Bus which supports many Cross Language Clients and Protocols and many advanced features while fully supporting JMS 1.1 and J2EE 1.4.

Eclipse RCP (Rich Client Platform) is a set of plug-ins added to the Eclipse platform for creating Rich Client Applications. These plug-ins are part of the Eclipse offering in the Runtime, SWT, JFace, and Workbench.

smartmontools contains utilities that control and monitor storage devices using the Self-Monitoring, Analysis, and Reporting Technology (S.M.A.R.T.) system built into ATA and SCSI hard drives. This is used to check the reliability of the hard drive and to predict drive failures. It is meant to be an up-to-date replacement for the ucsc-smartsuite and smartsuite packages, and is derived from that code....

jQuery UI is jQuery's official user interface extension. It is a collection of interaction plugins, widgets, and effects that extend jQuery to create a powerful user interface.

On-the-fly encryption software which can create a virtual encrypted disk within a file and mount it as a real disk. It can also encrypt a hard disk partition or storage device, such as USB flash drive. Moreover, TrueCrypt supports plausible deniability.

JFreeChart is a chart library for the Java platform that supports a wide range of charts including pie charts (2D and 3D), bar charts (horizontal and vertical, regular or stacked, with optional 3D-effects), line charts, XY plots, scatter plots, time series charts, high/low/open/close charts, candlestick plots, Gantt charts, Pareto charts, combination charts, and more. It is suitable for use in applications, applets, servlets, and JSP....

HandBrake is an open-source, GPL-licensed, multiplatform, multithreaded video transcoder, available for MacOS X, Linux and Windows

MythTV is a capable media center and DVR application with a distributed architecture allowing music, videos, recordings, photos and more to be viewed from any room in the home, office or institution.

The MythTV project was started in 2002 and quickly became the most popular application of it's kind. It continues to innovate and offers support for new media types as they emerge....

Phusion Passenger — a.k.a. mod_rails — makes deployment of applications built on the revolutionary Ruby on Rails web framework a breeze. It follows the usual Ruby on Rails conventions, such as “Don’t-Repeat-Yourself”.

Note that the Ohloh source analysis is incorrect. The statistics for C++ and comment count are wrong because the Boost library is included. It is also not true that there's a single developer, because Passenger is commercially supported by Phusion....