Question
Without having to wait for public tenders because those are only few times per year. Instead, I'm looking for some form of non-payback grants, corporate purpose donations, etc. Does anyone from you have such expertise so we could discuss a bit further? I already considered KickStarter and IndieGoGo but it's near impossible to get anything there and on top of that, people there want a share of revenue if and when earned.
Answer
What area or field are on in ? Depends.
Assuming you already know what kind of start up I would suggest trying to save money from your "9-5 job" or use the skills you have to set the basics of the start up by offering your skills relevant to it. In that way you also build up a portfolio.
Last but not least you can ask for help from different funds within EU and your country depending on which country. They help start ups with certain basics costs.
It's a bit tricky giving you more relevant tips without more context.