The best cricket leagues worldwide are below, which are playing all around the globe, and different players are playing from different nations together.
IPL (Indian premier league )
BBL (Big bash league)
PSL (Pakistan super league )
CPL (Caribbean premier league )
Vitality T20 Blast
These are the World Cricket Leagues.

IPL is an Indian premier league that is a T20 format operated by BCCI. IPL’s’s’s first edition began in 2008. The teams playing in every season of IPL are 10 now. The current champions are KKR.
Big Bash League (BBL)

The BBL Big Bash League is a league of Australian boards. The first edition was played in 2011-12. It is a T202020 format too. The number of teams that are playing is eight. The current champions are the Brisbane Heat.
Pakistan Super league (PSL)

Pakistan super league PSL is a league operated by PCB. The first edition of it was played in 2016. Firstly, PSL used to be played in the UAE due to security reasons but then shifted to Pakistan. The number of teams playing is six, and the format is T20. The current champions are Islamabad United.
Caribbean Premier league (CPL)

The Caribbean Premier League CPL is under the West Indian Cricket Board, which is a T2020 format. There are six teams that participate every year from different franchises. The first edition was played in 2013. The current champion is the Guyana Amazon Warriors.

The Vitality T20 Blast is under the ECB, which began way back in 2003. It’s a T20 format; the current champions are Somerset.
The leagues, which include both test-playing nations as well as other nations that play cricket, have players participating in the leagues and benefiting from them a lot, not only in terms of money but also in terms of improving their performances individually. These leagues produce quality cricket, which the audience does enjoy and appreciate. A good source of money for a board and country too.