Netidee
This year again, there is the [‘netidee’ funding pot] (https://www.netidee.at/), in which some of the projects submitted are sponsored with up to €50,000. Submissions are still possible until 17 July 2018. There are bound to be some OpenStreetMap or FOSSGIS projects that would fit in there.
The requirements for submitting a project are that all results are and remain open source or are published under a Creative Commons licence.