The best open-source Productivity Knowledge tools, curated: 24 in the registry, including Estela, Office365-REST-Python-Client, F-Droid 2.0: the FOSS Android app store ships its largest client rebuild in a decade. Every tool is open-source; each entry lists license, self-hostability, and links.
Estela· tool, 2026-09-29 Estela reconstructs billable hours from Claude Code and Codex transcripts plus git history, for developers and agencies who never fill in timesheets. Open source: yes (MIT); self-hostable (free tier runs locally; open-core, Pro/Teams add hosted sync). Freemium; brand-new (0 stars); maker jdleonruiz.
Office365-REST-Python-Client· tool, 2026-09-28 MIT-licensed Python client for SharePoint REST and Microsoft Graph — OAuth2 via app registration with client certificate or secret. The most complete community Python option for SharePoint, OneDrive and Microsoft 365 file operations, working within Microsoft's terms; complements the official msgraph-sdk-python.
F-Droid 2.0: the FOSS Android app store ships its largest client rebuild in a decade· news, 2026-09-25 F-Droid announced F-Droid 2.0 on 2026-09-24 — the largest rebuild of its official Android client in 10 years. Key components were rewritten in Kotlin with Jetpack Compose, and the app gets a redesigned Discover, Search and My Apps interface built around Material Design while keeping familiar F-Droid interactions. The announcement was corroborated by The Register, Notebookcheck and HowToGeek.
Whiteboard· tool, 2026-09-24 Whiteboard is an MIT-licensed desktop canvas where humans and coding agents such as Claude Code collaborate on software design, with AST-aware semantic diffs and decision logging. It is actively shipping — 434 commits, 303 stars, created 2026-08-18, last pushed 2026-09-24. It self-hosts as a desktop app and serves as a shared design surface between developers and their agents.
Basta· tool, 2026-09-23 MIT-licensed dead-code detector with a Rust engine that finds unused files, exports, imports and declarations across JavaScript/TypeScript and Python. It is a command-line developer tool for codebase hygiene — you run it against a repo and it reports what is provably unreferenced so it can be safely removed. Rust is the analysis engine, not a target language; the languages it analyzes are JS/TS and Python. Actively maintained (npm v0.3.0 published 2026-09-22).
Buzz· tool, 2026-09-22 Apache-2.0, self-hostable workspace from Block where humans and AI agents collaborate in shared rooms and channels built on a Nostr relay you run yourself. Agents hold their own scoped keys and every event is logged, so a team can hand agents real work — code review, bug triage, workflow orchestration — as permission-controlled, auditable teammates on infrastructure it owns rather than a vendor's.
Cookbook· news, 2026-09-22 A hosted shared task board where humans and coding agents (Claude, Codex and others) claim tasks atomically, return attributed 'receipts' showing cost and files touched, and accumulate a team's decisions into a shared memory that feeds future agent runs. It is a closed SaaS launch aimed at the coordination problem when several people each run agents — the build-vs-buy counterpart to self-hosted options like Buzz — but with undisclosed pricing and vendor-stated mechanics.
motif· tool, 2026-09-21 Apache-2.0 shared-memory system for teams of AI coding agents (TypeScript) that collects agent sessions from Claude Code, Codex and Cursor into one queryable graph of decisions, files and the ties between them, so a team can recall why something was done and stay consistent across tools instead of every session being an island. Self-hostable via Docker or npm with no license key, no feature flags and no limits on members, sessions or projects.
Octop· tool, 2026-09-18 MIT self-hosted AI assistant platform from Tencent Cloud (Python) that runs multi-user, multi-agent for a household or small team from a single instance: one process serves a web dashboard, a CLI, chat channels (Feishu, DingTalk, QQ, Discord, WeCom), an HTTP/SSE/WebSocket API, IDE integration over ACP, and cron automation, all sharing the same agents and data on your own machine. You bring your own LLM provider (OpenAI, DashScope, Ollama and others); nothing core requires a paid Tencent service.
Claude knowledge-work-plugins· tool, 2026-09-17 Apache-2.0 repo from Anthropic: 11 open-source, forkable starter plugins that turn Claude into a role specialist, covering sales, marketing, finance, legal, support, product, data, enterprise search, bio-research and productivity. Each is a manifest plus MCP tool connectors, slash commands, and skills Claude draws on. You install them into Claude Cowork or the Claude Code CLI and customize with your own context; they run inside Claude, not as standalone apps.
Rowboat· tool, 2026-09-17 Apache-2.0 TypeScript app from Rowboat Labs: a self-hostable multiplayer workspace for teams where each person brings their own AI assistant, and those assistants collaborate across shared Spaces with local knowledge. The Spaces server (Harbor) is open source and self-hostable; the desktop app runs against local models via Ollama or LM Studio, or hosted models with your own key. Optional voice and search integrations (Deepgram, ElevenLabs, Exa) take their own keys.
OpenWiki· tool, 2026-09-16 MIT-licensed TypeScript CLI from LangChain that writes and maintains agent-readable documentation of your codebase, so a coding agent has persistent context instead of re-deriving your repo on every task. It keeps state locally in ~/.openwiki and works against local repositories; it can run through local model backends (Ollama, LM Studio, any OpenAI-compatible endpoint) or hosted providers, so you are not forced onto a paid key.
OpenExecutive· tool, 2026-09-13 A self-hostable virtual executive advisory board: one executive voice backed by eight specialist agents (strategy, finance, HR, legal, ops, marketing, product, board comms), with RAG over your own company docs, episodic memory across sessions, and a follow-up scheduler. Ships Slack/email/Telegram/Discord/web/CLI.
LLM Wiki· tool, 2026-09-12 Open-source desktop app (GPL-3.0, 19.1k★; Tauri, TypeScript + Rust) that compiles your documents into a persistent, interconnected wiki instead of re-reading them per query like standard RAG: two-step chain-of-thought ingest, a knowledge graph with community detection, cited multi-conversation chat, web clipper, and Obsidian-vault compatibility.
Bending Spoons buys Miro ($1.355B) five weeks after Airtable ($1.285B) — and the exit math is a warning about whose tools you rent· news, 2026-09-11 Bending Spoons agreed to acquire Miro at a $1.355B enterprise value, five weeks after closing Airtable at $1.285B. SaaStr's analysis: roughly a third of both prices was the companies' own cash converting at 1.0x, with recurring revenue fetching only 2.3-2.7x — cash-flow-positive maturity bought very little at the finish line. Two core collaboration tools thousands of GTM stacks rent just changed hands.
'Agent replaces a paid service': an open-source Claude skill files UAE corporate-tax registration itself· news, 2026-09-09 A maker open-sourced an MIT-licensed Claude computer-use skill that drives the UAE Federal Tax Authority (EmaraTax) portal to complete corporate-tax registration, reporting the 1,250 AED agent fee was avoided and same-day approval. A concrete instance of the registry's core thesis — an agent replacing a paid service — not a GTM tool: the domain is narrow (UAE tax), so the value is the pattern and the verified-open skill, not ICP fit.
Maintainer relicenses from MIT/LGPL to EUPL to close the SaaS loophole· news, 2026-09-06 Henri Bergius (NoFlo, Midgard) relicensed his projects from MIT/LGPL to the EUPL-1.2 — an OSI-approved, EU-backed copyleft whose obligations extend to software offered over a network, closing the "SaaS loophole". Relevant when selecting self-hostable tools: license class is a deliberate maker choice, and network-copyleft (EUPL/AGPL) affects hosted redistribution, not internal self-hosting.
airtable.js· tool, 2026-09-03 ~2223 stars; complements pyairtable; VENDOR (Airtable) official JavaScript client for the Airtable REST API (PAT/OAuth). ToS-clean and authoritative for Node/browser.
gspread· tool, 2026-09-03 ~7492 stars; complements google-api-python-client; Ergonomic wrapper over the official Google Sheets API (OAuth2 / service account). ToS-clean; the go-to Python Sheets client. Subject to Sheets API per-minute read/write quotas.; via GitHub cross-ref, ossinsight.io
notesmd-cli (Obsidian CLI Community)· tool, 2026-09-03 ~1568 stars; complements obsidian-git; Go CLI acting on LOCAL Obsidian vault markdown files (plus obsidian:// URIs) — no platform account, no ToS/ban risk (local files). Active; formerly named obsidian-cli. Finalist for local-KB automation.
notion-sdk-js· tool, 2026-09-03 ~5649 stars; complements notion-sdk-py, ultimate-notion; VENDOR (makenotion) official JavaScript/TypeScript SDK for the Notion API (integration token / OAuth). ToS-clean and authoritative for Node projects.
notion-sdk-py· tool, 2026-09-03 ~2174 stars; complements notion-sdk-js, ultimate-notion; Sync+async Python client mirroring the OFFICIAL Notion API (integration token / OAuth). ToS-clean; the de-facto Python SDK. Standard Notion API rate limit ~3 req/s per integration.; via GitHub cross-ref, ossinsight.io
pyairtable· tool, 2026-09-03 ~892 stars; complements airtable.js; Python client for the OFFICIAL Airtable REST API (personal access token / OAuth). ToS-clean; de-facto Python SDK. Airtable API rate limit ~5 req/s per base.
Khoj· tool, 2026-08-31 A self-hostable AI 'second brain': chat with local or cloud LLMs over your own PDFs/Markdown/Notion/org-mode with semantic search and cited answers, build custom agents, and use it from the browser, Obsidian, Emacs, desktop, phone, or WhatsApp. Replaces several paid AI-assistant subscriptions.