Freelancer
In the Freelancer game by Digital Anvil, the jumpgate is an apparatus which provides travel from system to system. After the Liberty landed on Planet Manhattan and began exploring the New York System they came across the natural phenomenon known as the Jumphole. Ageira Technologies researched it and developed the Jumpgate, and in conjunction with Deep Space Engineering, provided the rest of the Houses with the technology- for a hefty fee.
Jumpgates form choke points through which traffic entering a star system must pass, making them favored ambush points for criminal groups such as the Outcasts and Corsairs. To guard against this, naval or military checkpoints are commonly situated near Jumpgates, who also take advantage of the opportunity to scan for contraband being smuggled into the system (although smart smugglers and criminals tend to make use of jump holes, naturally occurring versions of jump gates, rather than risk detection and capture.) Jumpgates are also outfitted with defensive turrets in order to cover the immediate vicinity.
Read more about this topic: Jumpgate