Raindrop.io
Freemium
Raindrop.io syncs bookmarks into the cloud and makes them beautiful as well as easy to search.
SemanticScuttle
Open Source
SemanticScuttle is a social bookmarking tool experimenting with features like structured tags and collaborative tag descriptions.
Compare StumbleUpon with alternatives
Compare Raindrop.io and StumbleUpon and decide which is most suitable for you.
Compare SemanticScuttle and StumbleUpon and decide which is most suitable for you.