pgAdmin III is the most popular and feature rich Open Source
administration and development platform for PostgreSQL, the most
advanced Open Source database in the world.

pgAdmin III is designed to answer the needs of all users, from writing
simple  SQL queries to developing complex databases. The graphical
interface supports  all PostgreSQL features and makes administration
easy. The application also  includes a syntax highlighting SQL editor, a
server-side code editor, an  SQL/batch/shell job scheduling agent,
support for the Slony-I replication  engine and much more. Server
connection may be made using TCP/IP or Unix Domain Sockets (on *nix
platforms), and may be SSL encrypted for security. No  additional
drivers are required to communicate with the database server.

Homepage:
https://www.pgadmin.org/
