Creately - The new interface for work to ideate, plan, and execute
Daily UI - Become a better designer in 100 days
LucidChart - LucidChart is the missing link in online productivity suites. LucidChart allows users to create, collaborate on, and publish attractive flowcharts and other diagrams from a web browser.
Design Pitfalls - A free email course to avoid n00b designer mistakes
Cacoo - A cloud-based diagram maker for companies, teams, and you.
LearnUX.io - Video courses for UX/UI Designers