This project is currently in Beta. You may encounter bugs or errors.
Features

URLs are automatically saved with an image, title and description
supports both markdown and a rich text editor
can be installed as a PWA on your mobile devices (and desktop)
share content via this app (if installed as an PWA and supported by your browser)
collections can be shared via a public available URL
links can be instantly pasted as new posts
can be hosted almost anywhere thanks to its use of the lightweight Lumen framework and well supported PHP language
works with and without a persistent storage layer (both filesystem and S3 are supported)
can also be hosted via Docker or on Heroku
protect your data with daily backups

Installation & Upgrade

Currently their are three options for you to choose from:

Normal classical way
Docker
Docker Compose
Heroku (not free anymore)

Additional Features

Backups
Bookmarklet