This software is well designed and highly customizable
LearnUpon - Create and deliver online courses to your employees, clients and partners. LearnUpon is the fastest growing learning management system in the world.
Now UI Kit - A beautiful Bootstrap 4 UI kit. Yours free.
Respondus - Respondus is the name of one of the best assessment programs for managing learning management systems.
Dashboard UI Kit - A modern & responsive dashboard UI kit for designers.
Adit Testdesk - Create, run, and grade all sorts of tests automatically!
Landing UI Kit - Handcrafted UI components for landing pages