All about Steins;Gate

Steins;Gate Visual Novel

The Steins;Gate visual novel was developed by 5bp. and Nitroplus, and officially translated by JAST USA.
It has been released in English for PC, PS3, PS Vita and additionally in Japanese for Xbox360, PSP, iOS and Android. For some of these systems there are unofficial English patches available. Its release date for the Steam platform is September 2016.

Info:

Released (PC):
JP: August 26, 2010
NA: March 31, 2014
Routes: 6
Length: 30 - 50 hours
Adaption: Anime, Manga

Steins;Gate Zero

Steins;Gate Zero is the sequel to Steins;Gate, which was announced on the 28th of March in 2015.
It takes place in the beta attractor field and it's 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 been released in Japanese on most platforms and in English for the PlayStation 4 and PlayStation Vita. For PC, there are unofficial English translations.

Info:

Released: November 29, 2016

Steins;Gate: Hen'i Kuukan no Octet

Nitroplus and 5bp along with GigasDrop also made another visual novel, Steins;Gate: Hen'i Kuukan no Octet, which is a free 8-bit non-canon extension of the true end of the original visual novel. It also contains text adventure game elements and while its length is not very long, figuring out what to do can take many hours by itself. There also is a manga adaption which can be found in the Manga & Light Novels section.

Info:

Released: October 28, 2011
Length: 2 - 10 hours
Adaption: Hen'i Kuukan no Octet Manga

Steins;Gate: Hiyoku Renri no Darling

Steins;Gate Hiyoku Renri no Darling is a comedy, set in odd timeline. It has been translated as a video series by ZakoBot on YouTube.

Info:

Released: June 6, 2011
Length: 10 - 30 hours
Adaption: Darling of Loving Vows Manga

Steins;Gate: Senkei Kousoku no Phenogram

In Steins;Gate Senkei Kousoku no Phenogram you relive the original visual novel, but through the eyes of the other lab members. It has also been translated as a video series by ZakoBot on YouTube.

Info:

Released: April 25, 2013
Length: 10 - 30 hours