Redberry is described as 'Collect your thoughts with this minimalist, but powerful Notes / To-Do app. Features include offline support, infinite nesting, search, and sync between devices' and is an website in the Office & Productivity category. There are more than 50 alternatives to Redberry, not only websites but also apps for a variety of platforms, including Windows, Mac, iPhone and iPad. The best alternative is Notion, which is free. Other great sites and apps similar to Redberry are Evernote (Freemium), CherryTree (Free, Open Source), WorkFlowy (Freemium) and Dynalist (Freemium).
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.
Workflowy lets you organise your brain into easily manageable lists. It also works as a single-pane outliner with inline notes. It offers one-click hoisting (zooming into branches). The online version syncs with mobile apps.