The Open-Source Tools Powering Modern API and AI Engineering — A Developer's Toolkit
The Open-Source Tools Powering Modern API and AI Engineering The developer tooling landscape is evolving fast, driven by open-source innovation and AI-native workflows. In this post, I want to highlight a collection of standout projects and platforms that are shaping how engineering teams build, test, and ship software in 2026. GoReplay — Battle-Tested Traffic Replay GoReplay is an open-source tool for capturing and replaying live HTTP traffic from production into test environments. With over 18,000 GitHub stars and 11+ years of production use across Fortune 500 companies, it remains one of the most reliable ways to do reality-based testing using actual user traffic instead of synthetic test data. The project is maintained by Leonid Bugaev and is now part of the Probe Labs ecosystem. jsonparser — The Fastest JSON Parsing in Go If you work with Go and need raw JSON parsing performance, jsonparser is the library to reach for. It's widely adopte...