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synchronization × 90android × 22
file-synchronization × 18
windows × 15
calendar × 11
linux × 9
database × 9
bookmark × 7
gratis × 6
backup × 6
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offline × 5
open-source × 4
web-browser × 4
note-taking × 4
mysql × 4
osx × 3
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cloud-service × 3
cloud-storage × 3
todo × 3
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web-apps × 2
library × 2