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communication × 67web-apps × 14
chat × 13
android × 7
open-source × 7
email × 7
gratis × 6
ios × 5
social-networks × 4
windows × 3
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project-management × 3
collaboration × 3
video-conferencing × 3
library × 2
python × 2
web-development × 2
api × 2
security × 2
self-hosted × 2
iphone-app × 2
productivity × 2
mobile × 2
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privacy × 2