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aifreetool.site is a curated directory of free AI tools across writing, design, image, video, coding, and productivity, with hands-on guides on how to use them and how to make money with them.

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Tools are reviewed for real-world usefulness, then listed with current pricing, key features, and practical use cases. Listings are refreshed as tools and pricing change.

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Articles and tool listings are reviewed and refreshed whenever tools, features, or pricing change, so readers get current information.

Buzz - Block's Open-Source Workspace for Teams of Humans and AI Agents

Buzz is an open-source workspace where employees and AI agents share the same channels, threads and code reviews. Block - Jack Dorsey's payments company behind Square and Cash App - released it on 21 July 2026 to cut Block's own dependency on Slack and GitHub, and it ships free under an Apache 2.0 licence at github.com/block/buzz.

Core Features

Built on the Nostr protocol, so every person and every agent holds its own cryptographic keypair rather than a platform-owned account.
Channels, threads, direct messages, canvases, voice, media sharing and search, laid out like a familiar team chat client.
Model-agnostic agents: plug in Anthropic's Claude Code, OpenAI's Codex or Block's own goose framework, each with scoped permissions.
Git integration in progress, letting teams plan work, review pull requests and manage repositories without leaving the chat window.
Every message, reaction, approval and Git event is written as a signed entry in one hash-chained audit log.

Use Cases / Best For

Startups running several coding agents that need one shared record of who - or what - changed something and why.
Teams with data-residency rules that want to self-host chat and code review on their own relay.
Open-source projects looking for a GitHub-adjacent home where agents are first-class contributors.

Pricing

Free - there is no paid plan and no per-seat subscription. Desktop builds for macOS, Windows and Linux cost $0, the source is Apache 2.0 licensed, and teams either self-host or use Block's managed version. The only real spend is the LLM provider sitting behind whichever agents you invite in.

Our Take

Best for small engineering teams already committed to agent workflows who would rather own their stack than rent it. Buzz shipped at version 0.4.21 with mobile clients unfinished, and each workspace still runs on a single relay, so the decentralised label is aspirational for now. That is the trade-off: genuine cryptographic identity and a full audit trail, against a product Block itself calls early. Paradigm's Centaur is chasing the same idea from inside Slack. See related picks in AI office tools or the terminal-side Termexo workbench.