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Math Open Reference is a free online reference for geometry teachers and students. Math Open Reference features animated and interactive drawings to demonstrate geometry terms and concepts. The table of contents on Math Open Reference is divided into four basic categories; plane geometry, coordinate geometry, solid geometry, and function explorer tools

A collection of videos, interactive activities, and quizzes all related to Biology.  Could be a great supplement to your instruction ot a place to refer students looking for extra support.  Most is free - there are parts that are available for purchase.

"A place for mathematicians to ask and answer questions."

collect, organize, and share research

Zotero [zoh-TAIR-oh] is a free, easy-to-use tool to help you collect, organize, cite, and share your research sources. It lives right where you do your work-in the web browser itself.