HospitalRun is one of the most popular offline-first electronic health records and hospital information system. HospitalRun's goal is a higher choice to its proprietary counterparts.
The software can be deployed in a variety of healthcare environments. Thanks to its technical feature that allows use even without connectivity, it is also suitable for clinics located in the most rural areas of the planet. With inspiring volunteers and contributors dedicated to leading HR's status as a free, open-source software solution for medical practices with a commitment to openness, kindness and cooperation.
Github project: https://github.com/HospitalRun/
Looks like it's all Javascript all the time.
Doesn't seem to have any actual installation instructions, they tell you to join yet another chat network for help. Yay.