I'm not sure... payments are always difficult, there don't seem to be any obviously good solutions.
They're not self-hosted, and they're more like Patreon than Kickstarter, but the nearest I can suggest are @Liberapay (https://liberapay.com) and #OpenCollective (https://opencollective.com).
(I'll boost your post in case others have more appropriate suggestions.)
Liberapay is a great alternative to Patreon and Facebook Fan Subscriptions.
- They take 0%
- European non-profit organization
- Open Source
- Funded by donations
Nearest I can think of is @Liberapay
Website is at https://liberapay.com
đ This week 400 patrons have donated 634 euros to 158 creators via https://liberapay.com/
[fr] Cette semaine 400 mécÚnes ont donné 634 euros à 158 créateurs via https://liberapay.com/
This week 471 euros have been transferred from 308 donors to 146 recipients. https://liberapay.com/
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Cette semaine 471 euros ont été transférés de 308 donateurs à 146 bénéficiaires. https://liberapay.com/
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