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Data engineering & databases

Collecting, moving, storing, querying, visualising and validating data.

Tools in this category

Great Expectations (GX Core)

Great Expectations project (open-source stewardship by Fivetran) · Data quality & validation

Python data-quality framework that declares Expectations about datasets, validates them against pandas, Spark or SQL sources and produces Data Docs

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

Matplotlib

Matplotlib Development Team (NumFOCUS) · Data visualization

The foundational Python plotting library for static, publication-quality figures with full control over every element, exported to PDF, SVG, PNG and PGF

Open sourceOpen sourceFreeLocalNov 2, 2026

OpenSearch

OpenSearch Software Foundation (Linux Foundation) · Vector databases

Apache-2.0 search and analytics suite forked from Elasticsearch and Kibana, governed by the OpenSearch Software Foundation

Apache-2.0Open sourceFreeSelf-hostedBroken

Pinecone

Pinecone Systems, Inc. · Vector databases

Fully managed, proprietary vector database service with serverless indexes, namespaces, metadata filtering and integrated embedding and reranking

ProprietaryFreemiumUsage-basedNov 2, 2026

Plotly

Plotly Technologies Inc. · Data visualization

MIT-licensed interactive charting libraries for Python (plotly.py), JavaScript (plotly.js) and R, plus the Dash framework for analytical web apps

MITOpen sourceFreeLocalNov 2, 2026

Tableau

Salesforce · BI & dashboards

Salesforce's visual analytics platform: Tableau Desktop authoring (now with a free edition), Tableau Cloud and Server for sharing, and Tableau Next for CRM analytics

ProprietaryFreemiumPaidLocalSelf-hostedNov 2, 2026

Typesense

Typesense, Inc. · Vector databases

GPL-licensed in-memory search engine in C++ offering typo-tolerant instant search, faceting, vector and hybrid search, with Typesense Cloud hosting

GPL-3.0Open sourceFreeSelf-hostedNov 2, 2026

Brave Search API

Brave Software, Inc. · Search & web-data APIs

Developer API over Brave's independent web index offering web, news, image, video, LLM-context and grounded-answer endpoints on prepaid credits

ProprietaryFreemiumUsage-basedNov 2, 2026

Milvus

Zilliz / LF AI & Data Foundation · Vector databases

Open-source vector database from Zilliz with Lite, Standalone and Distributed deployments, many index types and GPU acceleration

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

MySQL

Oracle · Relational databases

Oracle's widely deployed open-source relational database server, offered as a GPL community edition and commercial enterprise and cloud editions

GPL-2.0-only WITH Universal-FOSS-exception-1.0Open sourceFreeSelf-hostedBroken