Bun replaces four dev tools with one binary, plus three more worth your time
Bun is the one I keep coming back to. It's a runtime, a bundler, a test runner, and a package manager in a single binary, and it's faster than the Node tools it replaces at nearly every one of those jobs. The whole thing is free, no paid tier hiding the good parts. For a new project, there's almost no reason not to try it. The rest of this week leans the same direction: tools that let you own the thing instead of renting it. Plausible is a clean, privacy-first analytics dashboard you can self-host, no cookie banner, no handing your visitor data to Google. Cal.com does what Calendly does, scheduling links and calendar sync, except you can run the whole thing on your own server. And Lark's official CLI wraps 200+ commands across their suite, so if you live in Lark you can automate most of it from a terminal. None of these are new ideas. What changed is how good the open source versions got. A few years ago, self-hosting your analytics or your scheduling meant accepting a worse product to save money. That trade-off is mostly gone. Pick the tool because it's better, not because it's cheaper.
Fast JS runtime, bundler, test runner, and package manager
The Lens
Bun is a JavaScript and TypeScript toolkit in one binary: a runtime built as a drop-in replacement for Node.js, plus a package manager, test runner and bundler, and now a formatter (bun fmt) and type checker (bun check). It's free and MIT-licensed. Since December 2025 it's owned by Anthropic, which ships Claude Code on it.
Install is one curl command, and you can adopt it piece by piece: run bun install or bun test inside an existing Node project without switching runtimes. Bun 1.4 (August 2026) rewrote the whole thing from Zig to Rust and added more than 1,500 tests from Node's own suite. New releases land every few weeks, and there's nothing to host.
Solo through large teams: free. There's no paid tier and no Bun cloud. The cost is migration time, not money.
The catch: compatibility is close, not complete. Bun's own numbers show node:http, node:fs and node:stream passing 97% of Node's tests, so test your app before moving production. The October 1.4.4 release patched three high-severity bugs, including a brotli out-of-bounds write. And one AI company now steers your runtime. Bun promises it stays MIT; Node and Deno are your hedge.
A command-line tool for Lark/Feishu Open Platform, built for humans and AI Agents. Covers core business domains including Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more, with 200+ commands and 19 AI Agent Skills.
The Lens
This official CLI covers everything. Messenger, Docs, Base, Sheets, Calendar, Mail, Tasks, Meetings, and more across 200+ commands with 19 pre-built AI Agent skills. The setup is fast: 3 steps from install to first API call, with one-click app creation and interactive login. Built in Go, MIT licensed. Every command has been tested with real AI agents, so the output formats and error handling are designed for machine consumption, not just human use. This is official from Lark Technologies, not a community wrapper. The catch: this is only useful if you're in the Lark/Feishu ecosystem. If your team uses Slack and Google Workspace, there's nothing here for you. And 'AI Agent acts under your identity' means the agent has your permissions. A hallucinating agent could send messages or modify documents as you. The security model requires careful scoping.
Lightweight privacy-friendly web analytics
The Lens
Plausible replaces Google Analytics for people who only wanted the dashboard. Traffic, sources, top pages and goals sit on one page, with no cookies or personal data, so no consent banner. The self-hosted Community Edition (CE) is free under AGPLv3. CE runs on Docker Compose with Postgres and ClickHouse. Plan on 2GB of RAM and a CPU with SSE 4.2 or NEON, which ClickHouse requires. It ships as a long-term release twice a year, and its bot filtering is basic, without Cloud's data-center IP blocklist. Cloud is priced by pageviews. At 10k a month: Starter $9/month (one site), Growth $14/month (3 sites, 3 members), Business $19/month (funnels, revenue attribution). At 1M those become $69, $104 and $139. Yearly billing gives two months free. CE never gets funnels, user journeys, revenue goals, SSO or the Sites API. Solo: Starter. Small teams: Growth. Larger teams: Business or Enterprise, or CE if the basic dashboard is enough. The catch: on CE, patching is your job. In June Plausible disclosed a critical unauthenticated remote code execution bug (CVE-2026-8467) via a /storybook endpoint in CE 3.0 through 3.2.0. Umami and Matomo are the other self-hosted picks; PostHog covers the user-level analytics Plausible skips.
Open source Calendly alternative
The Lens
Cal.diy is what's left of open source Cal.com. In April 2026 Cal.com moved its production code to a private repo, renamed the public one Cal.diy, stripped out every enterprise feature, and relicensed what remained from AGPL to MIT. You get the core scheduling: booking pages, availability, the app store integrations and API v2, self-hosted. It needs Node 18+ and Postgres 13+. The README points at a cal.diy Docker image, but none was published when we checked, so plan to build it yourself with the included compose file. There's been no tagged release since the split; the latest is still the pre-fork v6.2.0 from March. Former Cal.com interns maintain it while Cal.com's engineers work on the closed product. Cal.diy is free, and its README recommends it for personal, non-production use. Teams, organizations, routing forms, workflows, SSO, insights and API v1 are gone; they live only in Cal.com's closed cloud, which is free for individuals, Teams at $16 per user a month ($12 billed annually), Organizations at $37 ($28 annually), Enterprise custom. Solo users who want to own their booking page: fine. Anyone needing team scheduling: this isn't it. The catch: this is a fork in maintenance mode, not a product with a roadmap. With no releases since the split, you're running community code that drifts further from Cal.com every month.
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