Another form of revenue for projects is applying for grants from places such as science foundations, universities, companies, individuals, or even government agencies. In the grantmaking world, there are people who have projects they want to see done whose goals and ideas might align with yours. There are many places to look review this grant organisation list at Science Magazine for a great start. Some might be simple search engine query away. Keep in mind that grantwriting can be a lot of work in many cases, and there are professionals that specialize in grant writing.