ILIAS is a powerful learning management system that fulfils all your requirements. Using its integrated tools, small and large businesses, universities, schools and public authorities are able to create tailored, individual learning scenarios.
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sticky sidebar
Sticky Sidebar is a pure JavaScript plugin for making smart and high performance sticky sidebar, works with sidebar if it’s taller or shorter than the viewport, integrated with resize sensor to re-calculate the dimensions automatically when the size of sidebar or its container is changed, supports jQuery/Zepto and compatible with Firefox, Chrome, Safari, and IE9+.
CSS - background clip
Stefan Judis, front-end developer, explains in this post how background clip is configurable for every background gradient separately. This post is part of his "Today I learned" series in which he shares all his learnings regarding web development.
Choo
Choo is a mini 4kb framework for creating sturdy frontend applications.