Best of WebAssembly — July 2025

1. 1
   Article

   Hacker News·40w

   epanet-js

   epanet-js is a new web application that brings EPANET hydraulic simulation to modern browsers using WebAssembly, built by experts from Iterating using open source code from the defunct Placemark mapping tool. The browser-based tool offers a significant improvement over expensive legacy Windows software that costs $16,000 annually, demonstrating how open source licensing can enable new businesses to create better solutions in specialized markets like water utility system planning.

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   4
2. 2
   Article

   Fermyon·40w

   Serverless A2A with Spin

   A2A (Agent-to-Agent) is a new open protocol that enables AI agents to discover and communicate with each other. The protocol uses JSON-based agent cards for discovery and JSON-RPC for interaction, supporting three communication modes: asynchronous sessions, streamed sessions, and push notifications. The tutorial demonstrates building a serverless A2A agent using Spin and WebAssembly that provides ethical reasoning using Google's Gemini model. The agent exposes its capabilities through a standardized agent card and handles requests via JSON-RPC, making it discoverable and interoperable with other A2A-compliant agents.

   16
3. 3
   Article

   Frontend Focus·37w

   Frontend Focus Issue 703: July 30, 2025

   A curated collection of frontend development articles covering new CSS features like carousel specs, masonry layouts, and scroll-spy functionality. Highlights include MDN's 20th anniversary celebration, practical React and Next.js patterns, WebAssembly DOM integration challenges, and Apple's upcoming Liquid Glass design aesthetic. Also features tools and resources including a world clock slider component and full-stack development guides.

   10