Workflowy is really great. For anyone who likes it, some similar-but-different online outliners also worth looking at are Checkvist, Dynalist, and Quire. https

Workflowy is really great. For anyone who likes it, some similar-but-different online outliners also worth looking at are Checkvist, Dynalist, and Quire. https://checkvist.com/ https://checkvist.com/ https://dynalist.io/ https://dynalist.io/ https://quire.io/ https://quire.io/ Disclaimer: I'm a paying customer of two of these four, and am likely to sign up for the other two as well, to support their efforts in online outlining. I just wish I could make up my mind which one I like best!