The best of Hacker News - May 20, 2025

1.
The Windows Subsystem for Linux is now open source

1203 points

2.
Zod 4

637 points

3.
Have I Been Pwned 2.0

444 points

4.
GitHub Copilot Coding Agent

388 points

5.
Claude Code SDK

310 points

6.
DDoSecrets publishes 410 GB of heap dumps, hacked from TeleMessage

297 points

7.
Jules: An Asynchronous Coding Agent

274 points

8.
Game theory illustrated by an animated cartoon game

249 points

9.
Launch HN: Better Auth (YC X25) – Authentication Framework for TypeScript

199 points

10.
Run GitHub Actions locally

198 points

11.
The forbidden railway: Vienna-Pyongyang (2008)

159 points

12.
Remarks on AI from NZ

145 points

13.
Kilo: A text editor in less than 1000 LOC with syntax highlight and search

104 points

14.
What are people doing? Live-ish estimates based on global population dynamics

87 points

15.
A shower thought turned into a Collatz visualization

81 points

16.
A man who visited every country in the world without boarding a plane (2023)

28 points

17.
Show HN: A free, privacy preserving, archive of public Discord servers

26 points

18.
Memory Consistency Models: A Tutorial

25 points

19.
Biff – a batteries-included web framework for Clojure

12 points

20.
Ann, the Small Annotation Server

8 points

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