I have a subscription with Online Writing ( a site that shows me the how to effectively work from home-http://paidonlinewritingjobs.com/) In addition, there are several other companies I use for Working at Home;

1. ODesk
2 Elance
3. FreeLance
4. Fiver

I know its a short list, but these are the companies that I have actually had experience with. There's more to come:)