ALEKS - ALEKS is a web-based artificially intelligent assessment and learning system that uses adaptive questioning to accurately determine exactly student knows.
Bootstrap 4 Cheat Sheet - An interactive Bootstrap 4 cheat sheet
ExamView Assessment Suite - ExamView lets you can create assignments, launch classroom assessment questions and collect real-time responses to evaluate student performance.
Bootstrap Zero - Open-source, free Bootstrap templates collection.
iSpring QuizMaker - iSpring Quiz Maker is easy-to-use quiz software. Create interactive quizzes and surveys in HTML5 & Flash and embed them in a website or publish for any LMS!
HackerThemes - Bootstrap 4 themes and tools for web developers