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Tech Levels for uninhabited worlds are listed "NA".

Some timelines have moved quantum and a few even changed "local present" in 4th edition those with only Classic sources are marked with "*". The number known is the number of timelines known to Homeline. This coupled with changes in the GURPS TL scale means that TLs from sources before 2004 may not be at the same TL in 4e. Note that GURPS 4e (2004) is not entirely consistent on how it uses the "^" ( superscience) notation and "^" didn't exist in GURPS Classic at all. Most of GURPS settings can be easily adopted as part of the Infinite Worlds settings which includes Infinity Unlimited. There are hundreds or more alternate worlds in the GURPS Infinite Worlds multiverse. 5 Realties not formally listed as part of the Infinite Worlds setting.
