Joomla useful Extension

After playing around with a number of freely available Joomla extensions, I find some pretty useful ones when developing joomla sites.

1. JCE ~ pretty much an upgrade from tinymce wysiswyg editor, recommended.

2. Simple image Gallery ~ display pictures in thumbnail formats (viewable in original size slideshow) from a folder, as the name says it's simple and it works well :). I suggest using this for a gallery page.

3. mosModule ~ show a module in a content, useful.

4. denVideo ~ play flashs, videos, musics in your content or modules, another useful one.

5. Fireboard ~ install this component if you want to have a forum in your site.

6. Virtuemart ~ Good shopping cart systems, but pretty complex if code modification is required. Use it as it is.

7. Community Builder ~ let the user members feel to be part of your web community! Uploading profiles and stuffs are nice features.

8. Facile Form ~ I love this addon, it is able to create simple to advanced web forms. Sometimes virtuemart order flow will be much of a hassle for a simple customer order and hacking the code will be too much of a work. This form builder will be able to sort it out :).
this is not install and go addon, but learning how to use it will be very useful.

All these extensions are great, one problem I find is that there is rarely any support in their forums anymore.
If there's anymore Joomla extensions that you find useful and simple, do add on :).