What are the best Magento extensions?

First person comment moved, created by user Kosbik:

I don't like that it's only Windows compatible, not a big deal, i use it with Parallel Desktop on an iMac 21" and it's working flawlessly.

Just wanted to alert you as to why there were edits on your content, I moved the first person text to a comment, as it does not fit with Slant's writing guide.