TheBrain
Freemium
TheBrain, formerly branded PersonalBrain, is a mind mapping and personal knowledge base software.
lumio
Free
lumio is an online content organizing platform.
SemanticScuttle
Open Source
SemanticScuttle is a social bookmarking tool experimenting with features like structured tags and collaborative tag descriptions.
Compare Pocket with alternatives
Compare SemanticScuttle and Pocket and decide which is most suitable for you.