Subversion is a version control system. Originally designed to be a compelling replacement for CVS in the open source community, it has far exceeded that goal and seen widespread adoption in both open source and corporate environments. The Subversion project produces Subversion's core libraries (written in C), a fully functional command line client (svn), repository administration programs, API bindings for various languages (Perl, Python, Java, Ruby, etc.), and various additional tools and scripts.
Conary is a distributed software management system for Linux distributions. It replaces traditional package management solutions (such as RPM and dpkg) with one designed to enable loose collaboration across the Internet. It enables sets of distributed and loosely connected repositories to define the components which are installed on a Linux system. Rather than having a full distribution come from a single vendor, it allows administrators and developers to branch a distribution, keeping the pieces which fit their environment while grabbing components from other repositories across the Internet.
The svnmailer is a tool that is usually called by a subversion hook to submit commit notifications in various ways (at the moment: mail via SMTP or a pipe to a sendmail like program, news via NNTP, or CIA live tracker notification via XML-RPC). It is derived from the original mailer.py distributed with subversion, but should be much more consistent, more extensible, and have many more features.
OpenLexicon is a business rules and business process management tool that rapidly develops applications for transaction and process-based applications. There are two main components of OpenLexicon: the metadata repository and the business rules engine. The OpenLexicon business rules engine is not Rete based. It has a predicate evaluator that includes a unique ability: it can evaluate small, inline Java expressions. OpenLexicon provides strong support for Web services, so complex rulesets can be published to a service-oriented architecture without writing code. An Eclipse plugin-in is available that creates a comprehensive WSDL and data type (.XSD) in your Eclipse project.
SVNChecker is a framework for Subversion pre-commit hooks in order to implement checks of the to-be-committed files before they are committed. For example, you can check for the code style or unit tests. The output of the checks can be send by mail, written to a file, or simply printed to the console.