All about Steins;Gate

Science Adventure Series

Steins;Gate is the second and most popular title of the so-called Science Adventure series. This is a series of visual novels, anime, manga and more, all set in the same universe. There are currently four main titles: Chaos;Head, Steins;Gate Robotics;Notes and Chaos;Child.
These four stories take place in different times and are not directly related to each other, but some characters are mentioned or appear in the other stories. There's also the Committee of 300, which is supposedly the source of all evil that happens in this universe.
A full overview of all SciADV content can be found on the Science Adventure Database.

Info:

Started: 2008
Titles: 4

Chaos;Head

Chaos;Head, or Chäos;HEAd, is a science fiction and horror story, mostly about delusions, and is the first title of the SciADV series. The visual novel was released in 2008 in japanese and there is no official english translation, but a fan translation can be obtained via the internet. The anime adaption is considered not to be very good compared to the visual novel, but the visual novel itself is absolutely worth playing.
Chaos;Head Love Chu Chu! is a romantic comedy spin-off visual novel released in 2010, but there is no english translation yet.

Info:

Released (VN):
April 25, 2008

Robotics;Notes

Robotics;Notes is a science fiction story, mostly about building robots, and is the third title of the SciADV series. The visual novel was released in 2012 but it has not yet been tranlated to english. Luckily, the anime adaption is quite good.

Info:

Released (VN):
June 28, 2012

Chaos;Child

Chaos;Child, or ChäoS;Child, is the most recent and fourth title of the SciADV series. It's a sequel to Chaos;Head and set six years later. The visual novel was released in late 2014 in Japanese, but it has not yet been tranlated into English. The anime has been announced in March 2015.

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Info:

Released (VN):
December 18, 2014