Database apps here include GUI clients for browsing and querying data, plus database servers packaged as Mac apps. A good client saves you from the command line when inspecting tables, editing rows, running queries and exporting results, and many support several engines in one interface.
Native clients like Sequel Ace, the maintained successor to Sequel Pro for MySQL and MariaDB, feel light and fast, while cross-platform apps such as Beekeeper Studio cover many engines. DB Browser for SQLite is the standard free SQLite editor, Postgres.app runs PostgreSQL as a regular Mac app, and Redis Desktop Manager handles Redis. Some clients reserve features for paid tiers, so check the license.