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FRED (Federal Reserve Economic Data)

Federal Reserve Bank of St. Louis · Market & fundamentals data

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Free economic database from the St. Louis Fed aggregating hundreds of thousands of US and international time series, with graphs, vintages (ALFRED), an Excel add-in and a keyed JSON/XML API

ProprietaryFreeNov 2, 2026

Obsidian

Dynalist Inc. (Obsidian) · Personal knowledge management

In-depth entry

Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish

ProprietaryFreePaidLocalBroken

Zotero

Corporation for Digital Scholarship · Citation management

In-depth entry

Free, open-source reference manager with browser connectors, word-processor plugins, a PDF reader, group libraries and optional paid file storage

AGPL-3.0-onlyFreeOpen sourceLocalNov 2, 2026

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