  JPARSEC is a Java library initially developed to implement a complete set of
algorithms to compute ephemerides. The project started twelve years ago and
soon evolved to also cover astrophysical modelling and outreach. JPARSEC itself
includes more than 250 000 lines of code, similar or larger than other popular
tools like Astropy, complemented with models and other projects operational
since years. The library is focused on being robust, optimized, well written
and documented, providing a complete set of tools for astronomers, with special
attention to radioastronomy. The projects written using JPARSEC as the core
library cover a wide range of fields from models with complete graphical user
interfaces to an ephemerides server with high quality charts, or even an
Android planetarium. In this Paper I present the main characteristics of
JPARSEC, with special attention to the core library and documentation, and I
describe the main projects developed based on it.
