Oracle REST Data Services version 20.3 was released in October, 2020.
ORDS 20.3 can be downloaded from here.
ORDS is included with both Oracle Database and Oracle SQL Developer installs, however you should check your versions and if it is not 20.3 you should download it from the above link.
New Features in 20.3.0
ORDS includes the SQL Developer Web feature however, this is disabled by default for On-Premise installation and you will need to enable it. For Oracle Autonomous Database users the SQL Developer Web is already enabled and it is called Database Actions.
This post covers both aspects of On-Premise installations for ORDS and Oracle Autonomous Database enabled features.