Obsidian
Dynalist Inc. (Obsidian) · Personal knowledge management
Local-first Markdown note-taking app with bidirectional links, graph view and a large community plugin ecosystem; optional paid Sync and Publish
ProprietaryFreePaidLocalBroken
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SQLite
SQLite Consortium / Hipp, Wyrick & Company · Relational databases
Public-domain embedded SQL database engine that stores a whole database in one file and ships inside most operating systems and browsers
Open sourceOpen sourceFreeLocalNov 2, 2026
WireGuard
WireGuard project (Jason A. Donenfeld) · Tunneling & remote access
Minimal, high-speed VPN protocol and implementation built on modern cryptography, included in the Linux kernel and available on macOS, iOS, Windows, Android and BSD
GPL-2.0-onlyOpen sourceFreeLocalSelf-hostedNov 2, 2026
Zotero
Corporation for Digital Scholarship · Citation management
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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