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Alternative Rules & Influence
(ttrpg.network)
Discussion of the various incarnations on the Traveller RPG by Marc Miller, et al.
SPI Universe had a nice little grid for modifying skills based on your experience with different planetary environments. TSR Alternity provided me with an alternative way of doing TLs Aftermath provided a talent system that grants a modifier to certain actions based on the talent you use. I keep tinkering trying to incorporate rules from other systems stress/coolness under fire from YZE, pushing a roll.
Mostly though I just run CT77 with boon/bane from MgT and T4 armour as damage dice reduction.