Tilemaker is written in C++ and uses temporary storage (RAM/on-disk) as part of the conversion process, rather than loading OSM data into a database.
Lua scripting is used to filter OSM data into vector tile layers. A Lua script is provided which is broadly compatible with the popular OpenMapTiles schema. The vector tiles can then be displayed with clients such as Mapbox GL or MapLibre GL.
Tilemaker was created by User:Richard.
The awesome vector tiles page lists other vector tile clients and generators.