microG

microG GmsCore is a free software reimplementation of Google Play Services. It allows applications calling proprietary Google APIs to run on AOSP-based ROMs like LineageOS, acting as a free replacement for the non-free, proprietary Google Play Services (sometimes referred to as the more generic term "GApps"). It is a powerful tool to reclaim your privacy and freedom while enjoying Android core features (although apps you use that take advantage of it may still be using proprietary libraries to communicate with microG, just as they do when communicating with the actual Google Play Services).

Features

• Opt-in to Google Services and extend application support
• On-/Offline location service
• Easy on battery, memory and CPU
• No bloatware
• Works on real devices, test emulators and virtual mobile infrastructure
• Free (open source) (Apache 2.0 licensed)

GmsCore includes the Unified Network Location Provider module (UnifiedNlp) which handles application calls to Google's network location provider. It relies on location and address lookup backends which must be installed separately. For more information on UnifiedNlp and its backends, please refer to the module's wiki.

For a full-working microG setup, you may consider to install a Google Play Store replacement application as well as the Services Framework Proxy (GsfProxy) module to provide Google's push messaging service.