Free or cheap apps for your smartphone or tablet.
Available as a mobile app for iOS and Android and also a Chrome extension, Forest helps you put down your phone and get productive!
Evernote/Evernote Web Clipper
Save, organise and annotate images, webpages, photos, scans and files and sync across all your devices. Online, app (iOS and Android) and extension for Chrome, Firefox, Safari and Edge.
Virtual note board where you can write tasks, add notes, upload files and save online content. Available online, as a Chrome extension or a mobile app (iOS and Android).
Save links, images and notes and sync these between your devices. Extension works with Chrome, Firefox and Edge. Also online and app for iOS and Android.