There’s none.
But if you are still adamant on doing it, I would suggest you to try open source computing grid.
You would basically dedicate your computing power to BOINC (Berkeley Open Infrastructure for Network Computing) projects and in return your would get rewarded with some Gridcoins.
There are hundreds of projects working on the betterment of the society. You can be part of it while just leaving your computer running in idle time.
It’s pretty much simple to get started. You can either crunch solo or join a pool. Then select a project only from the whitelist. Download and install Gridcoin wallet, setup your BOINC Manager and you are ready to contribute to the world.
BOINC video introductions:
Here’s an Install Guide.