Pathfinder vs TileStache: What are the differences?
Developers describe Pathfinder as "Routing as a service". Pathfinder is a new real-time routing service in public beta. Pathfinder calculates routes for transportation services. These routes are updated in real time as users make transportation or delivery requests. Through our SDKs, applications can subscribe to routes as they change in response to user requests. On the other hand, TileStache is detailed as "A Python-based server application that can serve up map tiles based on rendered geographic data". TileStache is a Python-based server application that can serve up map tiles based on rendered geographic data. You might be familiar with TileCache, the venerable open source WMS server from MetaCarta. TileStache is similar, but we hope simpler and better-suited to the needs of designers and cartographers.
Pathfinder and TileStache can be primarily classified as "Mapping APIs" tools.
TileStache is an open source tool with 670 GitHub stars and 273 GitHub forks. Here's a link to TileStache's open source repository on GitHub.