I wish I could, but Kickstarter is US only. The alternative, invested.in doesn't look that strong.
I think you're right that it's a model that would work well - if I could raise the money to code it I'd happily make it open source after that (running costs means it'd have to cost something to use on someone's server).
I'm not sure exactly what you are looking for, but IndieGoGo has had a lot of successful non-US projects. Community is building every day, and the payment options (e.g. PayPal & direct credit card) are not US only. Check it out.
I think you're right that it's a model that would work well - if I could raise the money to code it I'd happily make it open source after that (running costs means it'd have to cost something to use on someone's server).