osu! is described as 'Rhythm game based on the gameplay of a variety of popular commercial rhythm games. While aiming to keep authentic gameplay and scoring, osu! increases the epic factor through online rankings, multiplayer, replay exchange, and a huge community following' and is a popular Music Game in the games category. There are more than 10 games similar to osu! for a variety of platforms, including Windows, Android, iPhone, iPad and Android Tablet apps. The best osu! alternative is StepMania, which is both free and Open Source. Other osu! like games are Quaver, Clone Hero, Friday Night Funkin' and Frets on Fire.
Rhythm game for Windows, Mac, and Linux. It features 3D graphics, keyboard and dance pad support, and an editor for creating your own steps.
is is based on DDR if you know that rhythm game, so it is a very good alternative
Quaver is a community-driven and open-source competitive rhythm game with two game modes and online leaderboards. Create your own maps or challenge the world in online multiplayer matches.
Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller, Game Controllers, or just your standard computer keyboard. Download the game, copy your song charts into the song folder and enjoy hours of fun!.
Friday Night Funkin’ is a musical rhythm game where you compete in freestyle music battles.
Frets on Fire is a game of musical skill and fast fingers. The aim of the game is to play guitar with the keyboard as accurately as possible.
A free open-source circle-clicking rhythm game practice client for osu! beatmaps with Virtual Reality support. McOsu is developed separately from and has no direct affiliation with osu! or ppy Pty Ltd.
It's clone osu! on custom engine.
Malody is a cross-platform music game (Simulator) which is developed by a group of dedicated volunteers.
Tap Tap Reloaded is the ultimate community-driven rhythm game experience. Reloaded is built on what the community wants in a mobile rhythm game. Tap Tap Reloaded is powered by a highly qualified and experienced team of the best Tap Tap players in the world.
Flash Flash Revolution (or FFR) is a music-based rhythm game that runs through Adobe Flash and an Internet browser, making it a full-fledged online music title that requires no downloads or fees to play.
DJMax (often stylised as DJMAX and also known as DJ Max in North America) is an action-rhythm video game series created by the South Korean company Pentavision Entertainment which belongs to Neowiz holdings.
Web!Mania is a version of the "osu!mania" game mode of "osu!" developed to be played in web browsers, without the need to download anything.
Feel the beat as wannabe rockstar Chai and his ragtag team fight against an evil megacorp with raucous rhythm combat! From Tango Gameworks comes Hi-Fi RUSH, an all-new action game where the world syncs to the music.
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StepMania is also a good music game that can be adictive, and is for desktops, unlike most music games.