
1) British role-playing game 2) Danish rock music group 3) French magazine 4) Trojan horse
Found on
https://www.crosswordclues.com/clue/bifrost

1) Location in Norse mythology
Found on
https://www.crosswordclues.com/clue/bifröst
[Trojan horse] Bifrost is a backdoor trojan horse family of more than 10 variants which can infect Windows 95 through Windows 7. Bifrost uses the typical server, server builder, and client backdoor program configuration to allow a remote attacker, who uses the client, to execute arbitrary code on the compromised machine (which runs the serv...
Found on
http://en.wikipedia.org/wiki/Bifrost_(Trojan_horse)
[magazine] Bifrost is a French science fiction magazine that is published every three months. It was first published in April 1996. ...
Found on
http://en.wikipedia.org/wiki/Bifrost_(magazine)
[operating system] Bifrost is a lightweight distribution of Linux optimized for networking. It is named after Bifröst, the bridge which connects the world and the land of Gods in Nordic mythology. ==Primary Usage== Since the intended use is network infrastructure, reliability is the number one priority with performance a close second. It i...
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http://en.wikipedia.org/wiki/Bifrost_(operating_system)

In Norse mythology, Bifröst pronunciation or sometimes Bilröst or Bivrost, is a burning rainbow bridge that reaches between Midgard (the world) and Asgard, the realm of the gods. The bridge is attested as Bilröst in the Poetic Edda; compiled in the 13th century from earlier traditional sources, and as Bifröst in the Prose Edda; written in the ...
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http://en.wikipedia.org/wiki/Bifröst

(from the article `Asgard`) ...god had his own palace in Asgard, and many Germanic peoples believed that these mansions were similar in design to those of their own nobility. ... in Norse mythology, the watchman of the gods. Called the shining god and whitest skinned of the gods, Heimdall dwelt at the entry to Asgard, where he ... [2...
Found on
http://www.britannica.com/eb/a-z/b/62

Rainbow bridge connecting Midgard and Asgard.
Found on
http://www.factmonster.com/ipka/A0197623.html

In Norse mythology, Bifrost was the bridge between heaven and earth, visible as a rainbow, the colours being the light reflecting off the precious stones that comprised the bridge.
Found on
http://www.probertencyclopaedia.com/browse/D4.HTM

the rainbow bridge of the gods from Asgard to earth.
Found on
https://www.infoplease.com/dictionary/bifrost
No exact match found.