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Apps with 'Topic tags' feature
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. A non-profit community site driven by its users' interests. 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. Web and mobile platform for daily video & voice stories, specially crafted for distributed & remote teams.