I'm the CEO at Sourcegraph (universal code search for companies to use on their internal code). Our product is really optimized for searching a company's internal code right now, but soon we'll start working on offering much better search for public and open-source code as well. If you'd like to help out or just chat, please reach out! sqs@sourcegraph.com
Sourcegraph.com is universal code search and navigation across all public repositories. To use it on private code inside your company, run a self-hosted instance at https://docs.sourcegraph.com/#quickstart.
We've been so focused on internal code search for companies. See https://about.sourcegraph.com for some of the logos of well-known companies whose devs all use Sourcegraph. Because of that, our "public demo" site at Sourcegraph.com has a few limitations that we're working on lifting, such as only searching across a subset of popular repositories by default (unless you specify a specific subset with `repo:` in the query).