Papaly is a simple social bookmarking tool to manage links.

Kifi creates a full-text index of every web page shared, making them easier to find in Slack, Google search.

elCurator let you bookmark, read and collaborate with ease.

Diigo is a powerful research tool and a knowledge-sharing community.

SemanticScuttle is a social bookmarking tool experimenting with features like structured tags and collaborative tag descriptions.