pbsurf

I've been building https://github.com/styluslabs/maps with support for 3D terrain, custom layers, and plugins for search and routing.

Vector tiles are generated and served on-demand by https://github.com/styluslabs/geodesk-tiles so there's no need to download an entire country or region first.

I'm working on https://github.com/styluslabs/maps/ including a new 3D map engine (based on Tangram-ES) and JS plugin support, so while there is no offline routing yet, support for additional online routing services can be added by users.

I'm working on https://github.com/styluslabs/maps - has Sentinel-2 imagery, slope angle shading and custom slope shading including slope aspect.

https://github.com/styluslabs/maps - open-source maps app

GPU vector graphics library I released a few years ago: https://github.com/styluslabs/nanovgXC - basically a new backend for nanovg that supports arbitrary paths. Coverage calculation (for analytic antialiasing) is explained a bit here: https://github.com/styluslabs/nanovgXC/blob/master/src/nanov...

Getting sufficient antialiasing quality for 2D graphics is difficult on GPUs. https://github.com/memononen/nanovg accomplishes this with GL2/GLES2 level hardware for most of the stuff one would want to render as part of a GUI. My project https://github.com/styluslabs/nanovgXC supports rendering arbitrary paths with exact coverage antialiasing, but requires GLES3.1 or GL4 level hardware for reasonable performance.