This page contains edition-agnostic Traveller info and links.
Maps
The Traveller Map (the awesomest map of charted space)
Interactive Atlas of the Imperium
Various links to useful stuff
Traveller Integrated Timeline (Collected history of the 3rd Imperium)
Traveller Sector Information (Sector listing and where to read more)
Sheets (Mad Irishman’s Character Sheets)
BITS Task System (when using adventures written for a specific edition with another edition)
Cool websites
Don McKinney’s Traveller page (lots of useful links)
Imperial Encyclopedia (aka The Traveller wiki)
Traveller Downport (Traveller website collection/hub)
The Zhodani Base (Traveller website by fellow Swede Berka)
Traveller Publishers
Far Future Enterprises (FFE – Home to CT, MT, TNE, T4, 2300AD & T5 by Marc Miller et al. Basically GDW 2nd ed.)
Mongoose Publishing (Mongoose Traveller & 2300AD)
BITS (British Isles Traveller Support. Mainly for T4 but also all other editions)
Social media/discussions
Citizens of the Imperium (Traveller forum)
Traveller (Google Plus community)
For Traveller DIY writers/publishers
Mongoose Traveller Developer’s Pack
Far Future Enterprises Fair Use Policy
Traveller Software
Heaven & Earth (Mapping & World development | Windows)
Hexographer (software for making your own maps)
Errata Collection
Delta Quadrant 