Ask HN: Open-source equivalent to Ink File Picker?

I'm starting a new project and I'd love to use Ink file picker (https://inkfilepicker.com) but they're charging (IMO) a ridiculous price for their basic package ($19/mo) and the prices after you exceed the quotas are also very high.

I was wondering if there was an open-source equivalent. I know about basic file uploaders (like jQuery File Upload, etc..) but they only have awesome support for uploads from desktops, and I think the integration ideas that Ink has come up with are really neat (just not monthly pricing sort of neat).

Also, if there is anyone interested in doing a Kickstarter for something like this, I'd be willing to contribute $100 or so, and I would imagine a large amount of people would too.