While the base version is free, it offers in-app purchases for professional features like Jaimini astrology tools. 3. Maitreya's Dream (Open Source)
It supports over 23 divisional charts, multiple dasha systems (Vimshottari, Yogini, etc.), and advanced Shadbala and Ashtakavarga calculations.
Developed by P.V.R. Narasimha Rao, is widely considered the most comprehensive free software for Windows.
Researchers and advanced students who require customizability in ayanamsa settings (Lahiri, Raman, etc.) and topocentric vs. geocentric positions.