I've just checked the Traveller Developers' Pack, and it specifically prohibits software.
Which merely means you can't use the TLL. In the US, the design systems and the processes are NOT PROTECTED AS A MATTER OF LAW.
See the recent decision in Oracle vs Google.... Anything formulaically derived is exempt from copyright under US law, and Mongoose hasn't applied for patents (not that they'd be given, anyway).
So the only thing they could possibly enforce would be the Trademark. So you can't use the Pointy-arrow compatibility logo, nor the Traveller name.
They can't legally enforce that "no software" provision in any other way.
The ship design system is formulaic, hence not protected in the US.
The vehicle design system is formulaic, hence not protected in the US.
If Gareth used my numbers for prices of goods (which the few I've spot-checked, he did), they're sweat of the brow researched data, not protectable, as they're 1976 market prices in 1976US$. Mostly found on the internet.
All that leaves is CGen and World Design -
World Design is a process - not protectable
CGen makes too much use of the data within the tables, and some of that's prose, it's not real world... so it's the one area that looks copyright protected.
So, Mongoose's "no software" pretty much only precludes Character Gen, and blocks use of the Traveller Logo License and Traveller name.