SQL*Plus
SQL*Plus is a command-line tool that enables you to create, manage, and monitor CDBs and PDBs. You use SQL statements and Oracle-supplied PL/SQL packages to complete these tasks in SQL*Plus.
DBCA
Oracle Database Configuration Assistant (DBCA) is a utility with a graphical user interface that enables you to configure a CDB, create PDBs, plug in PDBs, and unplug PDBs.
Oracle Enterprise Manager Cloud Control
Cloud Control is a system management tool with a graphical user interface that enables you to manage and monitor a CDB and its PDBs.
Oracle SQL Developer
Oracle SQL Developer is a graphical version of SQL*Plus that gives database developers a convenient way to perform basic tasks.
The Server Control (SRVCTL) utility
The SRVCTL utility can create and manage services for PDBs.
No special tools are required to work with CDBs or PDBs.