Schools in Kerala use Kstars on GNU/Linux to explain the eclipse!
News in today's Malayalam paper "Metro Manorama":
The people of Thrissur district gave a "Pooram" like welcome to the solar eclipse; it was the main topic of discussion in schools and offices yesterday! People in large numbers witnessed the celestial spectacle using solar filters and on television. Using KStars and a GNU/Linux distro prepared by IT@School, a "simulated" eclipse was shown in schools across the state. Everywhere, students gathered in large numbers to witness the demonstration.
Here is a Hindu article which mentions use of Kstars.