Diagrams, Brainstorming, Timelines, & Infographics

Infographics
Piktochart http://piktochart.com/
Canva https://www.canva.com/
Plot.ly https://plot.ly/

Brainstorming & Timelines 
Popplet http://popplet.com/app/#/home Example http://popplet.com/app/#/489
Padlet http://padlet.com/ 
XMind http://www.xmind.net/
Timeline JS – http://timeline.knightlab.com/ Example http://digitalageviruses.weebly.com/ 

Diagrams
LucidChart (can add to Drive) http://www.lucidchart.com/
Creately (online) http://creately.com/

Word Cloud Generators
Tagul https://tagul.com/