We have managed and worked with the following technologies & platforms.

Operating Systems: Microsoft (all), RedHat, Centos
Programming languages: Ruby, Python, PHP, ASP, VB, C++, C#, T-SQL,
RDBMS: Oracle, Microsoft SQL, MySQL;
IDE: MS VisualStudio
Technologies & Frameworks: Ruby on Rails .Net, ASP.NET
CMS: Drupal, Wordpress, Magento

We use SVN to store project repositories.