[takeda]

EnterpriseDB seems like PostgreSQL version that can emulate most Oracle's features, although I would personally use it as a step in migrating (i.e. move from Oracle to EDB, then gradually convert your data to be PostgreSQL only, once done move to pure PostgreSQL)

[boshomi]

With EDB ships a full featured PostgreSQL with some additional useful time-savers and a lot of experience for a fair amount of money. A part of this money goes direct into PostgreSQL development. So it's a fair deal.

[takeda]

That's a good point, also comes with support and is still much cheaper than Oracle.