All about Steins;Gate

Steins;Gate originally was a visual novel, the anime adaption was created later by Funimation and studio White Fox in collaboration with Nitroplus. It consists of 24 episodes and also has a special 25th episode which is set after the original series.
As an introduction to Steins;Gate 0, an alternate ending to episode 23 has been released. Episode 23 β was translated by WhyNotSubs and can also be viewed on YouTube.

The movie, Steins;Gate: Fuka Ryouiki no Deja vu, is set after the original series, about 1 year after the the special 25th episode.

This short series was made in collaboration with IBM and it consists of four episodes. It's supposed to be an advertisement, but it's still very enjoyable.

Steins;Gate 0 is a midquel to Steins;Gate, it is recommended to watch the original anime and episode 23 β first.
It takes place in the beta attractor field and is based on the Epigraph Trilogy which can be found in the Manga & Light Novels section, and Drama CD Beta which can be found in the Drama CDs & OSTs section.
It has aired in 2018 and consisted of 23 episodes plus one extra OVA episode.

Warning
These videos contain heavy spoilers for the main story, several Drama CDs and The Distant Valhalla.

The endings in the Steins;Gate Pachinko game are animated versions of endings from previously existing routes and timelines in the other the media. They were translated by Sarkkoth on YouTube.

Steins;Gate LIVING ADV is a stage play of the visual novel. It is being translated by Sarkkoth on YouTube.