Similar to the freelance article writing, there are many employers out there looking for people who can do basic computer programming, create applications for computers or phones or even create websites for them.  If you are able to do these sorts of things then there is excellent money to be made.

You will be given a brief outline of what is required and you work on your own in your own home.  Most websites have a bid system for this kind of work and you put in the price that you would feel comfortable charging for the required work.  If they pick you, this is what you will get paid.