Cehpeus Modern is an interesting mod to the Cepheus Light system to cover modern gaming using the 2d6 style of sci-fi roleplaying system. I picked this up because a complete set of animal rules were in here, they had a vehicle combat system, some magic and cybernetics, and I liked the tight feel to this set of rules.
Light and Fast
Not as Zero-Based and Specialized
There are no real broken-out specialty skills here, just a basic list of broad skill areas of knowledge. One engineering skill, one pilot skill, one gun combat skill, and so on. I feel this is good for a lighter-weight game as I spend a lot of time in M2E Traveller going over skill lists, picking specialties, and looking up what covers what. A broad skill list with specialties allows greater character customization and also keeps skill levels down through more choices, so M2E Traveller (and also Cepheus Engine) are better "character builder" games in my feeling.