List of tools and techniques for working with relational databases inspired by other awesome lists.

• Oracle - Software and packages specifically for Oracle and PL/SQL.
• SQL Server - Software and packages specifically for SQL Server and T-SQL.
• MySQL - There is already a whole awesome list just for MySQL.
• PostgreSQL - There is alread a whole awesome list just for PostgreSQL.
• Cross Platform Stuff
  • Formatters - Tools and sites that will format your ugly SQL code.
  • Tools - Other cool tools and sites.

• SQL Developer - Oracle's Free IDE for PL/SQL development and administration of Oracle databases
• SQLcl - Free command line interface for Oracle Database.
• SQL Tools for Oracle - Lightweight frontend for Oracle DB development.
• Oracle Database Express Edition - Free entry level database to develop and deploy applications
• Alexandria PL/SQL Utility Library - Collection of utility packages for PL/SQL
• PLSQL-JSON - PL/SQL library to encode/decode JSON
• utPLSQL - Unit testing framework for PL/SQL

• SQL Server Express Edition - Free SQL Server Database to develop and deploy applications
• SQL Server Data Tools - Integrated environment for developers to design and build database and other business intelligence solutions for MS SQL Server stack.
• tSQLt - Unit testing framework for SQL Server
• MSSqlCLI - A command-line client for SQL Server with auto-completion and syntax highlighting

• SQL Format - Instant SQL Formatter
• Poor SQL - Instant Free and Open-Source T-SQL Formatting (look here for the plugins and whatnot: https://github.com/TaoK/PoorMansTSqlFormatter )
• ExtendsClass - Online SQL formatter

• SQLPage - Open-source SQL-only website builder
• PixQL - Command-line image processing tool in SQL by @Phildo
• SQL Fiddle - Easly test and share database problems and their solutions. Can use different backend DBMS's (MySQL, PostgreSQL, MS SQL Server, Oracle, and SQLite)
• SqlPad - A web app for running SQL queries and visualizing the results
• ERAlchemy - ERAlchemy generates Entity Relation (ER) diagram from databases
• BigBash - Open-source converter that generates a bash one-liner from an SQL Select query, no database necessary
• Flyway - Database migration tool
• Liquibase - Source Control for your database
• Rumba RDBM - Database migration tool, plain-SQL, and declarative definition supported
• PgCLI - Postgres CLI with autocompletion and syntax highlighting
• LINQPad - LINQPad is not just for LINQ queries, but any C#/F#/VB expression, statement block or program.
• SchemaSpy - we will do the best to simplify documentation process of your database
• MissionKontrol - Self-hosted admin panel to manage one or more MySQL/PostGRES databases.
• DBeaver - Free multi-platform database tool for developers, database administrators, analysts and all people who need to work with databases. Supports all popular databases.
• EverSQL - SQL query optimization and database observability, powered by AI.

• Curated SQL Learning Resources on Hackr.io - Programming Community Curated Resources for learning SQL
• Basic and advanced concepts of SQL with examples on Scaler - A curated interactive space for aspiring programmers to learn and master their SQL skills.