https://www.drivethrurpg.com/en/product/469431/cepheus-universal
Cepheus Universal is not a Traveller replacement, it is more of a universal 2d6 science fiction game. This does not "do" the Traveller genre that well, since it is specifically designed to simulate over other science fiction IP and setting and emulate anything.
We have capital ships, high tech weapons, genre support for teleportation devices and other gear, support for almost any tech level you want, vehicles, a full assortment of vehicle weapons, spaceships, augments, cloning, computers, AI, space combat, planet and system generation, mega-structures, alien creation, encounters, planetary travel, time travel, referee advice, sample NPCs, robots, and advice for creating settings.
This is the most complete and comprehensive space opera RPG since the classic Space Opera. This is this generation's version of that classic game, a game that does it all, can simulate any IP out there, does anything from TL 0 cave-people to TL 15 star federation explorers with teleport pads, the game does it all.
The game is so expansive and complete it makes an excellent expansion for Mongoose Traveller, and can introduce a lot of fun things into those games. If you want a special bit of tech or gear, you will find it here. You need to be careful making sure it fits into the setting, but you have all sorts of everything here.
The only this this game doesn't do well is a Traveller like experience. It goes hard on simplifying and making so many system work in a generic context, that the Traveller style flavor and quirks of the Cepheus SRD are lost. You are better off using the Cepheus Engine RPG for that, or Cepheus Deluxe. Or play in the Imperium using Traveller.
For any generic 2d6 science fiction gaming, or you are trying to simulate an existing IP with a 2d6 set of rules, this is your game.