1. SQuirreL SQL is an open-source Java SQL Client program that will allow you to view the structure of a JDBC compliant database, browse the data in tables, issue SQL commands etc.
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    • Mac
    • Windows
    • Linux
    • Online
    • Self-Hosted
    • Cloudron
    Redash helps you make sense of your data. Connect and query your data sources, build dashboards to visualize data and share them with your company. Self-hosted software is free and open source, hosting service by Redash is subscription based.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    Firebird is a relational database offering many ANSI SQL-92 features that runs on Linux, Windows, and a variety of Unix platforms. Firebird offers excellent concurrency, high performance, and powerful language support for stored procedures and triggers.
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  2. Data visualization and business intelligence (BI) platform for aggregating, sharing, collaborating, and pulling insights from raw databases, as well as built-in connections to Google products.
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    • FreeOpen Source
    • Mac
    • Windows
    • Linux
    • MySQL Community Edition
    • MariaDB
    • Microsoft SQL Server
    • CockroachDB
    • Amazon Redshift
    • PostgreSQL
    Free & Open Source SQL editor and database manager. Works with MySQL, Postgres, SQLite, SQL Server, Maria DB, CockroachDB, RedShift and more. Available for Windows, Mac, and Linux. Great features: - Clean, tabbed interface for SQL editing.
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  3. Cockroach is a distributed key/value datastore which supports ACID transactional semantics and versioned values as first-class features. The primary design goal is global consistency and survivability, hence the name.
    • FreeOpen Source
    • Linux
    Sequeler is a native Linux SQL client built in Vala and Gtk. It allows you to connect to your local and remote databases, write SQL in a handy text editor with language recognition, and visualize SELECT results in a Gtk.Grid Widget.
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  4. Free online SQL Formatter for SQL Server - Beautify SQL statements instantly and convert code into well formatted script. Powered by Devart's SQL Complete.
  5. sqlmap is an open source penetration testing tool that automates the process of detecting and exploiting SQL injection flaws and taking over of database servers.
  6. SiYuan is a desktop Markdown Block-Reference and Bidirectional-Link note-taking application. Support fine-grained block-level reference and Markdown WYSIWYG.
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  7. SQLiteSpy is a fast and compact GUI database manager for SQLite. It reads SQLite3 files and executes SQL against them. Its graphical user interface makes it very easy to explore, analyze, and manipulate SQLite3 databases.
  8. Azure Data Studio (formerly SQL Operations Studio) is a free, light-weight tool, that runs on Windows, macOS, and Linux, for managing SQL Server, Azure SQL Database, and Azure SQL Data Warehouse; wherever they're running.
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  9. DbVisualizer is the universal database tool for developers, DBAs and analysts. It is the perfect solution since the same tool can be used on all major operating systems accessing a wide range of databases.

    Compare the editions here: http://www.dbvis.com/features/feature-list/
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  10. Titan is a scalable graph database optimized for storing and querying graphs containing hundreds of billions of vertices and edges distributed across a multi-machine cluster.
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  11. PopSQL is a modern SQL editor for teams that lets you write queries, visualize data, and share your results. Features: - Share queries by URL, and organize them in folders
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