Earlier quoted context omitted.
My first thought would be patreon or another of those services where people can sponsor monthly.
How realistic is the patreon schema? Say you would need to support 2-3 members team of highly professional software developers... Is patreon realistic for that?
Both Patreon and Kickstarter is oriented towards consumer goods but Sciter is a B2B product. Software-wise people use Kickstarter and Patreon for consumer goods like games where you need literally thousands of fans to be profitable.
Sciter is a really good quality software and I believe it can overtake QT in future, but I got a feeling you might want to go with VC funding and possibly change the business model.