ZheYe
Quora clone write in Ruby on Rails.(A Chinese version of Quora but not maintenance anymore)
Free and open source software (F/OSS, FOSS) or free/libre/open source software (FLOSS) is software that is both free software and open source. It is liberally licensed to grant users the right to use, copy, study, change, and improve its design through the availability of its source code.
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