Originally posted by beatspete
The main space agencies would be NASA and the European Space Agency (ESA). ESA use Arian 5 or Arian 6 rockets I think.
There is no Ariane 6. The Ariane 5 is the newest model. Search for Arianespace (maybe also EADS),
Link to the different launcher-families made by Arianespace.
and the most important agencies are:
NASA
ESA
the Russian one (iirc RosaviaKosmos)
the Chinese one
there's a few others that might be interesting:
most notably the Japanese one (have their own launchpad and thus launchers iirc, got renamed to JAXA if I'm not mistaken),
the Brazilian one (one of their launchers blew up last year iirc),
the Indian one (not sure if they launched anything)
and the Israeli one (they did launch something, not sure how recent but it was with their own missile)