mycompiler.io
Online SQL editor for writing and testing SQL queries without setting up a local database.
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convertcsv.com
ConvertCSV.com is a collection of online tools for converting CSV and Excel data to and from formats such as JSON, XML, SQL, YAML, KML, GeoJSON, HTML, Markdown and PDF. It also provides a CSV viewer and editor, a CSV validator, SQL querying and data extraction tools. The tools run on the client side, so data never leaves the computer.
drawdb.app
drawDB is a free, open-source online database schema design and ER diagram tool. It supports drawing ER diagrams, generating SQL for PostgreSQL, MySQL, SQLite, SQL Server and Oracle, and real-time collaboration. The editor runs in the browser with no account required, and Pro adds cloud storage, teams and collaboration.
dbeaver.io
DBeaver Community is a free, open-source database management tool for relational databases such as MySQL, MariaDB, PostgreSQL, SQLite and Apache Family. It includes a data editor, SQL editor, task management and database maintenance tools, plus AI Chat and an @ai command. A separate commercial DBeaver PRO version adds advanced features.
getdnote.com
Dnote is a command-line notebook that stores notes in a SQLite file and provides full-text search. It ships as a single binary without dependencies, works with the user's own text editor, and is free and open source. An optional self-hosted server with a REST API enables syncing notes across devices.
programiz.com
Programiz provides free online compilers and code editors that run in a browser for languages including Python, JavaScript, SQL, C, C++, Java, HTML and CSS. It also offers interactive lessons with practical code that can be run directly in the browser. The site states no installation or sign up is needed.
sqlook.com
SQLook is a web-based SQLite database manager that runs in the browser on the client side, with no installation or server required. It opens and creates SQLite databases, shows database structure and statistics, and includes an SQL query editor with syntax highlighting and query history. It also offers a visual query builder and a database generator with sample data population.
tableconvert.com
TableConvert is a free online table converter and data generator tool. It supports conversion between more than 30 formats, including Excel, CSV, JSON, Markdown, LaTeX and SQL. The site also offers an online table editor, a table generator, web page table extraction and a Chrome extension.