Tried to find a useful contact form extension (non commercial) for Joomla. After trying multiple extensions I almost gave up on finding a usefull one. Most are extremely limited in functionality and need a commercial license to get the full functionality.
At last I found ‘aiContactSafe’. It works out of the box, you don’t need a engineering degree to configure the contact form and is highly flexible (multiple forms possible, custom field layout).
The is worth mentioning and hopefully saves other people the agonising search for a good contact form extension.