Shaarli - Shaarli is a minimalist link sharing software you can install on your own website
LinkLocker - LinkLocker is a lightweight bookmarking service with an emphasis on privacy.
Pocket - When you find something you want to view later, put it in Pocket.
Diigo - Diigo is a powerful research tool and a knowledge-sharing community
wallabag - Save the web, freely.
Linkman - Linkman Pro allows for managing large amount of URLs in its own database.