GoFlow allows:

+ Two-way crowdsourcing
Works equally for massive sensor data collection and focused queries.

+ Private and shared data stores
Let mobile apps share contributions for common/generic services.

+ Backend jobs and firehose API
Backend data processing as well as data stream filtering and replay.

+ Accounts, reputation and incentives
Use the appropriate incentive mechanisms and cleanup unwanted contributions.

Read more about the GoFlow crowdsourcing server by Ambientic.