In 2025, software development crossed a quiet threshold. In our latest Octoverse report, we found that the fastest-growing languages, tools, and open source projects on GitHub are no longer about shipping more code. Instead, they’re about reducing friction in a world where AI is helping developers build more, faster. By looking at some of the areas of fastest growth over the past year, we can see how developers are adapting through: - The programming languages that are growing most in AI-assisted development workflows. - The tools that win when speed and reproducibility matter. - The areas where new contributors are showing up (and what helps them stick). Rather than catalog trends, we want to focus on what those signals mean for how software is being built today and what choices you might consider heading into 2026. ## The elephant in the room: Typescript is the new #1 In August 2025, TypeScript became the most-used language on GitHub, overtaking Python and JavaScript for the first time.…