What would be a good website to use where multiple people can contribute to a "fund" that is paid after a condition is met / product delivered?
For example, I own a home automation hub. People can write apps for it that let them use a device (e.g. a Philips Hue lightbulb). If they can't code, they come to forums and request an app. It's up to someone to code it for them, which may not happen if the only people who owns that device can't code.
A bounty would let the user say "I own a FooTech remote that I want to use with the hub. I'm willing to pay $25 for the app". Other people could stop by and say "Yeah, I own that remote too. I pledge $10" until someone steps in and writes the app, then claims the bounty.
In a similar scenario, a developer could come in and say "I own a Baz Inc. light bulb. Who wants an app?" and people could "kickstart" the development by pledging an amount until the goal is met and the developer can then write the app.
If such a site doesn't exist, can you recommend other ways of achieving this idea?
EDIT: As this is product specific (i.e. the home automation hub example), a "formal" crowdfunding site might scare people off, so the easier to set up and start, the better. I was thinking of something like "Chip In", but that site no longer runs.