Qollector is described as 'Collect anything, see it everywhere, share with anyone, and find it anytime!' and is an app in the Office & Productivity category. There are more than 100 alternatives to Qollector for a variety of platforms, including Windows, Mac, Android, iPhone and Online / Web-based. The best alternative is Google Keep, which is free. Other great apps like Qollector are Microsoft OneNote (Freemium), Evernote (Freemium), Simplenote (Free, Open Source) and Raindrop.io (Freemium, Open Source).
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.