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 McOsu.
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.
Friday Night Funkin’ is a musical rhythm game where you compete in freestyle music battles.
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.
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.
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.
Malody is a cross-platform music game (Simulator) which is developed by a group of dedicated volunteers.
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.
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.
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.
A new motion-based game to experience your favorite artists and music in an unrivaled multi-sensory way.
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StepMania is also a good music game that can be adictive, and is for desktops, unlike most music games.