Lookmark - Track updates from the apps you've bookmarked on iTunes
Short - The reading list for busy people
Save This! - "Save to Facebook" bookmarklet for any URL on the web.
Corpus - Curate, take notes and share your reading list
fwrdto.me - Send web pages to your email inbox in just one click
Must-Read for Slack - Build controllable must-read lists for your team in Slack.