Galileo/GPS/BeiDou/Glonass open source monitor.
Found via https://hackaday.com/2019/09/24/tracking-the-satellites-that-keep-us-on-track-monitoring-gps-galileo-beidou-and-glonass/
The source code can be found on https://github.com/berthubert/galmon

See also the articles https://berthub.eu/articles/posts/galmon-project/ and https://berthub.eu/articles/posts/improved-galileo-fix-time/
Read https://berthub.eu/articles/posts/galileos-eccentric-satellites/, all formulas are approximations.

The Galileo satellites metadata are information about the satellite properties which need to be known in order to properly implement advanced processing algorithms for precise orbit determination or Precise Point Positioning (PPP). These include physical characteristics such as mass, area or reflectivity, the attitude law and antenna parameters such as phase center offsets and variations. More information about PPP and GNSS data processing can be found in [3], [4] or [2]. For Galileo SIS details, please refer to [1].

[1] European GNSS (Galileo) Open Service Signal In Space Interface Control Document. European Union, 2016.
[2] B. Hofmann-Wellenhof. Global Positioning System Theory and Practice. Springer, 2001.
[3] J.M. Juan Zornoza J. Sanz Subirana, M. Hernández-Pajares. GNSS DATA PROCESSING. European Space Agency, 2013.
[4] A. Leick. GPS Satellite Surveying. Wiley-Interscience, 1994.

Work in progress, fixing old Kai Borre Matlab code to run in Octave and hence be callable by Python to work with RINEX data
Working on updating the code to run in modern Matlab and Octave for use with oct2py in calling from Python.
Currently the functions easy3.m easy4.m easy5.m run in Octave and Matlab, reading the default included files.
MIT license.

Article describing the state of dual-frequency GNSS reception on Android devices as of 2018-06.

uBlox NEO-M8T Reference Board with SMA antenna connectors for your RTK systems, UAV systems, Robots, RC, FPV or other projects. Ultra small and light.

Accelerating GNSS Software Receivers

Fernández-Prades, Carles; Arribas, Javier; Closas, Pau

This paper addresses both the efficiency and the portability of a computer program in charge of the baseband signal processing
of a GNSS receiver.

Has Galileo-capable receiver using uBlox {LEA,MAX,NEO}-M8[S] modules.

Module with uBlox NEO-M8T and antenna.

Show the visibility of GNSS satellites.
See https://github.com/taroz/GNSS-Radar for source and options which can be passed via the URL.

GNSS receiver hardware (IP cores) with LEON or RISC-V processors.