Top 3 Java routing-engine Projects

Graphhopper

26 4,673 9.3 Java

Open source routing engine for OpenStreetMap. Use it as Java library or standalone web server.

Project mention: The Open Source GraphHopper Routing Engine 8.0 Released | news.ycombinator.com | 2023-10-18

Well I think what he means is that we dropped the explicit support of Android and the example app with offline maps (Mapsforge), see this issue: https://github.com/graphhopper/graphhopper/issues/1940
But offline routing should still work on Android. But as you need JDK 1.8 support this will exclude a few older Android versions and devices, I think.

openrouteservice

19 1,264 9.8 Java

🌍 The open source route planner api with plenty of features.
WorkOS

workos.com sponsored

The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.
freerouting

7 1,090 9.3 Java

Advanced PCB auto-router

Project mention: Java 21 will introduce Unnamed Classes and Instance Main Methods | /r/ProgrammerHumor | 2023-06-04

step 1: find a java project you want to compile. For the purpose of this post I'm using this one: https://github.com/freerouting/freerouting

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020).