Mega Man Rock Force!

Secret Maryo Chronicles is an Open Source two-dimensional platform game and is using an Open Graphics Library for the best possible graphic design and stock performance.

[Frogatto & Friends is free and open source on Windows and Linux, on the other platforms it costs $4.99].

Mega Man Revolution is fan made game that mimics the look and feel of classic 8-bit Mega Man.

Megaman Unlimited is a Megaman fan-game in the classic 8-Bit NES style both in sound and visuals. It is similar to Megaman 3 and Megaman 9-10 in design philosophy. MMU is made by fans for fun. It is not related to the official series’ canon.

A Megaman game with more than thirty bosses and powerups in a huge, Metroid-style world.

Welcome to the Minilens experiment.

Shovel Knight is a sweeping classic action adventure game with awesome gameplay, memorable characters, and an 8-bit retro aesthetic created by Yacht Club Games. You play as the eponymous Shovel Knight, a small knight with a huge quest. Shovel Knight has come to this valley with two goals: to defeat the evil Enchantress and save his lost beloved. He wields a ShovelBlade; a multipurpose weapon whose techniques have now been lost to the ages. Always honest and helpful, Shovel Knight is a shining example of the code of Shovelry: Slash Mercilessly and Dig Tirelessly! »

A fan-made game based on the Castlevania series. Play as Efrain Lecarde, a knight of the church, who is sent to investigate a strange event that occurred in the cemetery of his hometown of Segovia Spain.

Between MM3 and MM4 there was a MM adventure, never told, until now:

Descend into the DarkVenture down into a beautiful, ruined world of insects and heroes

Street Fighter X Megaman is crossover game where you play as Megaman battling against the characters of the Street Fighter series.

Kid Chameleon is a side-scrolling platformer from SEGA, now available across multiple platforms via Steam and recently the SEGA Forever Collection.

Eternal Daughter is a freeware action-adventure game. The protagonist, Mia, is daughter of the Lorian priestess and an unknown father. Like the rest of her people, she is enslaved to do menial labor, under the supervision of her half-brother Hume.