Apps with 'Topic tags' feature

  1. Qiqqa is a free research and reference manager. Search for, read and annotate your PDFs. Then review your work, write up and create bibliographies instantly.
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  2. A non-profit community site driven by its users' interests.
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  3. Emerald was built to help people meet each other. In the modern world it's so fast paced it's often really hard to meet new people.
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