The most likely candidate for this, is Webkit/ Chromium. For more details, consult the Design Documentation.For our Android app, we would like to embed our own browser/rendering engine. These features are implemented as configuration flags, patches, and custom scripts. Disable features that inhibit control and transparency, and add or modify features that promote them (these changes will almost always require manual activation or enabling).Remove all uses of pre-made binaries from the source code, and replace them with user-provided alternatives when possible.Remove all code specific to Google web services.Remove all remaining background requests to any web services while building and running the browser.Ungoogled-chromium addresses these issues in the following ways: In addition, Google designed Chromium to be easy and intuitive for users, which means they compromise on transparency and control of inner operations. However, Chromium still has some dependency on Google web services and binaries.

Without signing in to a Google Account, Chromium does pretty well in terms of security and privacy. Help is always welcome! See the docs/contributing.md document for more information. Unlike other Chromium forks that have their own visions of a web browser, ungoogled-chromium is essentially a drop-in replacement for Chromium. Ungoogled-chromium retains the default Chromium experience as closely as possible. It also features some tweaks to enhance privacy, control, and transparency (almost all of which require manual activation or enabling). Ungoogled-chromium is Google Chromium, sans dependency on Google web services.

Chromium source code github