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OpenGrok is a fast and usable source code search and cross reference engine, written in Java. It helps you search, cross-reference and navigate your source tree. It can understand various program file formats and version control histories of many source code management systems.
Official page of the project is on: https://oracle.github.io/opengrok/
OpenGrok uses semantic versioning and the version components further indicate more details about updating to newer version. The version scheme is major.minor.micro and change in any component is interpreted as:
Generally it is possible to go backward only within the micro version.
The project has been originally conceived in Sun Microsystems by Chandan B.N.
For full list of contributors see https://github.com/oracle/opengrok/graphs/contributors
There are Slack channels on https://opengrok.slack.com/
You can run OpenGrok as a Docker container as described here.
In fact, http://demo.opengrok.org/ is using the
opengrok/docker:master Docker image.