Points Reward System Plugins ?

Hello everyone , i am looking for a plugin that ads a point reward system to wordpress website . I saw cube points and punchtab , those are good plugins and i like the features , I am interested in more of a plugin that rewards members with points for Downloading files and completing tasks like share the page etc… They can then use the points to redeem for something like gift cards .

Anyone knows a good plugin that can reward members for downloading or something similar ?

Thanks in advance