Everything else I've found seems better suited for a startup with revenues. In the UK there is a platform called Seedrs.com which seems perfect, but they haven't yet opened to US businesses.
When I was starting my company we used a platform called FundersClub in the US.
We had to go through a pitch and get formally accepted in order to work with them.
We went on their platform and proceeded to raise $100K. Our company also received some great publicity from being on the platform.
Another option is Republic Labs which is similar and also based in the US.
Call me if you have any questions on the equity platform process.