- Its Open source, User friendly , Easy to customize and yes no signup required😊!And you can also save to Google Drive and restore later! Superb
- Lucidchart is without a doubt the best in my opinion. It's fast, simple, complicated when you need it to be, and supports full collaboration and sharing.This one's pretty easy to use. It also has tons of integrations—Slack, G Suite, Box, Microsoft Office Suite, Dropbox, Jira, etc— and has mobile apps. I've mainly used it to map stories for writing projects, bit it's a pretty robust tool with a lot of different use cases.