I've been working on a small Django project called https://CodeSnippetSearch.net. It allows you to search through code snippets using natural language. Currently, Python, Java, Go, Php, Javascript, and Ruby programming languages are supported.

As with any cool project nowadays, CodeSnippetSearch is powered by neural networks (six in fact - one for each programming language). The project is open-sourced and you can read about the implementation details here: https://github.com/novoselrok/codesnippetsearch