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The 2018 Shoot»Em Up Construction Kit (SEUCK) competition is currently underway, organised by The New Dimension (headed by Richard Bayliss) who are known for producing a library of freeware games for the Commodore 64. (vintageisthenewold.com)
Ninite is the only safe centralized Windows freeware download site we've found. (howtogeek.com)
Cave Story was first released as freeware for PC in 2004 and has since released on a wide number of platforms, so this might not be the first time you've been able to play it. (nintendocastle.com)