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arXiv

arXiv (independent non-profit, formerly hosted by Cornell University) · Research dissemination

Free, moderated open-access preprint server for physics, mathematics, computer science, statistics, quantitative finance, economics and related fields, with an open API and bulk access

Open sourceFreeNov 2, 2026

ClickHouse

ClickHouse, Inc. · Analytical engines & OLAP

In-depth entry

Open-source columnar OLAP database server for fast aggregations over billions of rows, with MergeTree storage, SQL and a managed ClickHouse Cloud

Apache-2.0Open sourceFreeLocalSelf-hostedNov 2, 2026

OpenAlex

OurResearch · Literature discovery & review

In-depth entry

Open catalog of the global research system: works, authors, sources, institutions and topics under CC0, served by a REST API, web app and S3 snapshot

Open sourceFreeFreemiumBroken

ORCID

ORCID, Inc. · Research dissemination

Non-profit registry of persistent researcher identifiers (ORCID iDs) with user-controlled records, Public and Member APIs, OAuth sign-in and an annual CC0 public data file

Open sourceFreeEnterpriseNov 2, 2026

OSF (Open Science Framework)

Center for Open Science · Reproducibility & research software

Free, open-source research management platform from the Center for Open Science for projects, preregistrations, registries, preprint services and linking outputs across storage providers

Apache-2.0FreeSelf-hostedNov 2, 2026

Zenodo

CERN (with OpenAIRE) · Research dissemination

In-depth entry

Free general-purpose research repository operated by CERN that assigns DOIs to datasets, software, papers and other outputs, with a REST API, OAI-PMH, GitHub release archiving and CC0 metadata

Open sourceFreeNov 2, 2026

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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