- Gitcoin grants
- Ethereum Foundation
- Ethereum Community Fund
- MolochDAO (WIP)
- GiveEth (help with applying for grant in the GrantOps channel and talking about the tech of your project in the social coding channel
- Ethereum DEVGrants, although this may be outdated by the above Ethereum Foundation link.
- Aragon Nest
- WeTrust
- Web 3 Foundation
- Protcol Labs
- ZCash Foundation
- EthPrize (bounties)
- Cosmos
- Social Alpha Foundation
- Open Tech Fund
You could consider investment funding sources such as ICOs, DAICOs, and DAII, but few projects are actually suited to such schemes. Also, venture capital funding and angel investments generally require the fundee to be for-profit.