The OED is an authoritative guide to the meaning, history, and pronunciation of 600,000 words— past and present—from across the English-speaking world.
Online legal citation software that can be used in combination with Zotero. For more about using Juris-M see Georgetown Law Library's tutorial.
[Free.]
Cloud storage for photos, documents, and videos. Accessible from any device and allows for easy sharing.
[Free up to 2 GB, with premium service available.]