pretrace is a preload library that allows specified (dynamically linked) applications to always be executed under a debugging environment. pretrace allows you to specify the percentage of invocations which will be traced, to help you "keep an eye" on applications without bringing the machine to its knees.
retainCounter is an application that converts a simple [object release] into a NSLog(@"object retainCount: %i",[object retainCount]); [object release]; command. This is sometimes useful if developers wish to know the current count of an object before it is released, which makes it easier to detect memory leaks.
Streber is a wiki-based project management tool. Freelancers and small teams can easily use it to set up projects and keep track of tasks, milestones, issues, bugs, efforts, etc. Project user rights can be adjusted (e.g., to provide clients a limited view of the current project state).
Teamtrac is a tool to correlate different sources of information regarding the software engineering process. It is used by companies to monitor their own software development process, and by outsourcing companies to provide on-the-fly information to their customers. It can provide the glue between tools like a source repository (like CVS or Subversion), a ticketing system like Trac or Bugzilla, and a time tracking tool like Tutos, Kimai or, if you're unlucky, some simple spreadsheets. It can be used to provide statistics and evaluations across the boundaries of each of these tools.