Sky Atlas is an interactive map of the night sky — showing millions of stars, thousands of deep sky objects (DSOs), and more! It's an app for amateur astronomers to help them plan their observations and explore the night sky.
-> skyatlas.appStarplot is a free and open source (MIT licensed) Python library for creating star charts and maps. It supports many map projections and has a styling framework that lets you customize the design of your plots. It's used by astrophysicists and amateur astronomers around the world.
Fun Fact: The All Sky Map was created with Starplot!
-> starplot.devThe Big Sky Catalog is a compilation of various Star and Deep Sky Object (DSO) catalogs, tailored for the purpose of visual observation of our beautiful night sky. Currently, it contains over 2 million stars compiled from the Hipparcos, Tycho-1, and Tycho-2 catalogs.
-> github.com/steveberardi/bigsky