Creators of Super Smash Flash Making an Official Indie Crossover

Fraymakers looks to be the most ambitious indie crossover fighting game yet, with a successful Kickstarter campaign that is still ongoing.
Successfully funded on Kickstarter!

AN AMAZING A Hat IN Time MOD For Super Smash Bros Ultimate ( I love this )

Indie showcase: Super Mario Bros. Crossover < NAG

Creators of Super Smash Flash Making an Official Indie Crossover Fighting Game

crossover with indie characters (what do you think?) : r/ShovelKnight

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Fraymakers - an indie crossover platform fighter from the people behind the Super Smash Flash games

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Nintendo has Smash Bros. Sony has Playstation All-Stars. Why hasn't Microsoft made or licensed a party fighting game full of their iconic characters yet? - Quora

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Super Smash Flash 2, McLeodGaming Wiki