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Please be aware that different projects may have different design goals(speed, accuracy, data sources, etc.). Please do your own research on which one is the best for your use case.
This page is not a complete list of all alternatives.
Consider see repos in Lookup Libraries section of evansiroky/timezone-boundary-builder first.
A question on Stack Overflow also: How to get a time zone from a location using latitude and longitude coordinates?.
ringsaturn/tzfpy#94