What are some alternatives?
When comparing Raindrop.io and Tagpacker, you can also consider the following products
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
Pinboard - Pinboard is a personal archive for things you find online and don't want to forget.
start.me - A Modern-day bookmark manager. A place for your favorites. A news feed (RSS) reader. A browser startpage. A portal for your team.
Papaly - Papaly is a simple social bookmarking tool to manage all your links.
Bookmark OS - Bookmark OS is like Mac or Windows optimized for bookmarks.