I find IPE to be a life-savior when it comes to generating physics illustrations which come with their share of math toppings. The editor has nice utilities for latching on to the boundaries, intersection, center etc of geometric figures. The spline tool is the best I have seen anywhere. Layers are handled with grace. LaTeX is rendered instantly. It is very easy to produce a multipage document. What more can one possibly want?
Inkscape - Inkscape is a free, open source professional vector graphics editor for Windows, Mac OS X and Linux.
Insta HMS - Insta HMS is a cloud-based solution that can be used in multi-center clinics and hospital with security protocols.
PGF and TikZ - PGF/TikZ is a tandem of languages for producing vector graphics from a geometric/algebraic...
Qliq Secure Texting - HITECH and HIPAA compliant secure texting & text messaging app for hospitals, clinics, and healthcare facilities to assist medical professionals.
draw.io - Online diagramming application
Zipnosis - Zipnosis operates a virtual health care platform that connects patients and clinicians through phone and video interviews.