SQL

Google Codelabs provides guided, hands-on tutorials for building applications and adding features across developer technologies.

This Google Cloud documentation page introduces BigQuery public datasets and links to other BigQuery resources and documentation.

CosmoSim provides results from cosmological simulations, including MultiDark and Bolshoi projects and galaxy catalog data.

APPLAUSE archives historical photographic plates and related image materials for research and discovery.

Hacksplaining teaches secure coding through interactive browser lessons covering OWASP Top 10 and GenAI threats.

Teams can use Dot as an AI data analyst to ask questions, generate SQL and charts, and produce reports through Slack or Teams.

awesome-system-design-resources provides free materials for learning system design and interview preparation.

PrivateGPT provides an API layer for local model based AI applications, including RAG, tools, MCP, and text to SQL.

AskYourDatabase lets users query databases in natural language and receive SQL, answers, and charts.

AI for Database connects data sources and answers questions in plain English, with dashboards and alerts.

Data Engineering Practice Problems provides exercises for practicing data engineering skills.

Squidex provides open source headless CMS software with support for PostgreSQL, MySQL, and SQL Server.

Talkberry.ai offers AI language tutoring with interactive conversations and real-time feedback across 25 listed languages.

Run an SMTP and IMAP mail server with Docker Mailserver, which includes LDAP, anti-spam, and anti-virus components.

Use qsv from the command line to inspect, transform, and work with CSV and other tabular data.

Wren AI turns natural-language questions into SQL, charts, and dashboards across data sources.

Enables data-driven, interactive data analytics and collaborative documents.

Create, search, and edit SQLite or SQLCipher database files with DB Browser, an open-source visual database tool.

A SQL database with Git-style version control, Dolt supports branching, merging, pushing, and pulling data.

myCompiler provides an online SQL editor for writing, running, and testing SQL scripts.

Browse leaderboards and statistics from DBDB, an encyclopedia of database systems.

SQL Easy teaches SQL through 31 interactive browser exercises using SQLite, with hints and practice in common query clauses.

Code can be edited, compiled, and run in many languages through myCompiler’s online IDE.

ArrayCat converts strings and lists between formats such as comma-separated values, programming-language arrays, and SQL queries.