Astrarium provides tools for calculating planetary signs, house cusps, and planet-to-house placements using swe4r (Swiss Ephemeris wrapper).

Astrolith is a decoupled astrological data calculation engine that generates structured JSON output. It supports multiple chart types including Natal, Solar Return, Progressed, Composite, and Transit charts.

Uses swe4r bindings for Swiss Ephemeris, note license for Ephemeris data

Ephemeris provides dignity and relationship calculations around the existing `swe4r` binding to the open source Swiss Ephemeris.