MechSim — Kinematics simulator
Simulate planar mechanisms in seconds. No install required
What it does
Design, simulate, and analyze planar linkage mechanisms directly in your browser. MechSim is a high-performance, zero-install kinematic simulator built for engineers, students, and makers. Featuring a robust Newton-Raphson constraint solver, it delivers professional-grade accuracy for complex 2D motion. Sketch your ideas, iterate in real-time, and visualize velocity or acceleration without the bloat of traditional CAD. Powerful, accessible, and 100% free. Engineering simplified.
Does the same job
all alternatives →- DKDyna-Kinematics – A 2D physics simulator with some unique features2020 · github.com · ▲78
- MMMuscle-Mem, a behavior cache for AI agents2025 · github.com · ▲226
Hi HN! Erik here from Pig.dev, and today I'd like to share a new project we've just open sourced: Muscle Mem is an SDK that records your agent's tool-calling patterns as it solves tasks, and will deterministically replay those learned trajectories whenever the task is encountered again, falling back to agent mode if edge cases are detected. Like a JIT compiler, for behaviors. At Pig, we built computer-use agents for automating legacy Windows applications (healthcare, lending, manufacturing, etc). A recurring theme we ran into was that businesses already had RPA (pure-software scripts), and…
- SMSimBricks – Modular Full-System Simulation for HW-SW Systems2024 · simbricks.github.io · ▲67
Hi HN, we are building SimBricks, an open-source simulation framework for heterogeneous systems, especially with custom hardware. SimBricks modularly combines existing simulators for machines, networks, and hardware, allowing you to build, test, and evaluate intricate complete systems in a virtual environment. Head over to the SimBricks website (https://simbricks.github.io/, also has a quick demo video) to learn more. We have pre-built docker images, and you can even immediately play around on codespaces. Concrete use-cases: - Evaluate HW accelerators, from early design with…
More work this month
the category →
The app store for voice native apps that lives in your notch
Work · 29d ago · voiceos.com
Mac-native app for screenshots, recordings and collaboration
Work · 5d ago · cleanshot.com
Launched alongside, April 2026
the whole month →
- AG
Thought the resources for GPU arch were lacking, so here we are
Life & fun · Apr 2026 · jaso1024.com
- IB
Built a ~9M param LLM from scratch to understand how they actually work. Vanilla transformer, 60K synthetic conversations, ~130 lines of PyTorch. Trains in 5 min on a free Colab T4. The fish thinks the meaning of life is food. Fork it and swap the personality for your own character.
AI · Apr 2026 · github.com
- BC
Life & fun · Apr 2026 · sam-burns.com
- IB
With social media and now AI, its important to keep the indie web alive. There are many people who write frequently. Blogosphere tries to highlight them by fetching the recent posts from personal blogs across many categories. There are two versions: Minimal (HN-inspired, fast, static): https://text.blogosphere.app/ Non-minimal: https://blogosphere.app/ If you don't find your blog (or your favorite ones), please add them. I will review and approve it.
AI · Apr 2026 · text.blogosphere.app