Steve Jackson took a good crack at a system to cover the basics of any type of gaming with having a few generic abilities, and basic it around skills, and just some garden variety dice, and not many of.
A lot faster and easier to use than something like the HERO system, so points for that, and there are a huge number of decent and interesting supplements if you want to delve in depth into any one setting.
4 out of 5
The above link is the complete list of post from this blog, updated each week, if you want to browse like that rather than search.
This list is quite long, and has become longer than I ever thought so in the interests of loading speed it is now situated elsewhere.
Similarly I am working on a simple website to browse by author that combines Free SF Reader and Not Free SF Reader that is extremely bare bones now, and can be found at the second URL above.