There isn't a default Cepheus setting. It came to be after Mongoose changed licensing terms for Traveller. So Cepheus is a fork of the OGL content for MgT1. A lot of third party publishers had material for that, and pivoted to Cepheus to continue their line.

Kosmic is A Cepheus setting (not The), but you can also have Solis from the same publisher, there's Hostile and Orbital from Zozer, etc. Just search for Cepheus on DTRPG and you'll find plenty. They each have their own twist, so read their elevator pitch.

Thank you, added it!

Not really, no, just full fledged settings with rules. Trying to keep a concise list. You're welcome to start a post for those, though. It would definitely fit the community.

Oh, it's a game! At first I thought it was a pen, then a map drawing app, then a geomorph set.

Zozer Games has a few solo Traveller books that are well regarded.

There's one aptly named Solo for general traveller adventures, there's Hostile Solo for an Alien / Aliens feel and some really cool squad mechanics. I think there's a third supplement, but I'm not sure.

Edit: aha! The third book! Classic Traveller style, I'm guessing by the price there's minimal artwork.

Will you be using the default skill list or will you tweak it?

There is something to be said about non combat focused accessories. Water reclamation & filtration system. Air purification, I can see a vacuum rated suit that has the air storage and CO2 scrubbing as an installable module to reduce weight in breathable atmosphere missions. Jetpacks. Battery pack, with standard connectors so not only it powers the suit for an extended time, it can also power your energy weapons and tools. A grappling hook/winch.

And, not an accessory, but hook points all around the suit to haul crap around in satchels and the like. Logistics is paramount for war.

Zozer game's Discord might be a good place to find players.

We are legion.

It's lifted straight up from the source material. As far as seventies series go, S: 1999 took itself quite seriously, in a good way. It's still sort of zany and the science isn't there in the plot, but the models and the casting more than make up for it.

Thank you and welcome!