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If you download an indie game for free and you end up enjoying it, consider sending a tip to the developer, if they take them. Just send what you think it's worth. Making a video game, even a very simple one, is very difficult and time-consuming. Be a part of making someone's dream come true.
@swashberry applies to FOSS as well.
@swashberry
And this made me donate to Anuken - the developer of Mindustry :)