Flownote is described as 'is clean and simple note taking software with sketching support' and is an website in the Office & Productivity category. There are more than 100 alternatives to Flownote, not only websites but also apps for a variety of platforms, including Windows, Android, Mac and iPhone. The best alternative is Joplin, which is both free and Open Source. Other great sites and apps similar to Flownote are Standard Notes (Freemium, Open Source), Notion (Freemium), Microsoft OneNote (Freemium) and Evernote (Freemium).
Joplin is a free, open source note taking and to-do application, which can handle a large number of notes organised into notebooks. The notes are searchable, can be copied, tagged and modified either from the applications directly or from your own text editor.
With so many tools, it's hard to keep everyone on the same page. Notion is a new tool that unifies them all. It's like Google Docs, but everything is organized and discoverable by your team. Real collaboration in real-time.