I understand that it is an ICAO requirement for all published procedures, including airport charts to be available in the national AIP and that the AIP should be available digitally (eAIP). The eAIP should be kept up to date and any changes noted in AIC or NOTAM.
Not all countries have published an eAIP but lots have (pleased to find one for Nepal recently) and generally as @Ephedrin87 says a simple search will produce them. There is also ChartFox website which collates many of the AIP charts.
Some of the AIP airport charts are notably superior to the Jeppesen ones (best to taxi around Heathrow with the official UK chart as it has much more necessary detail than the Jeppesen one).
I’ve only come across one payware where the Taxiways differed from the chart which is KHPN (White Plains).