I use a lot of open source software for day-to-day jobs and in the same spirit as the software, I'd like to share some of my knowledge with the community.
So far I'll be covering drupal, sugarCRM and civiCRM among others. I seem to write hundreds of modules a year. Some for a specific purpose which would probably not help much but others extend the standard software in some pretty weird and wonderful ways.
If there's something specific that anyone needs, just shout and I'll have a look in the module library (see: collection of messy folders in hundreds of project files).