Ubertesters

Ubertesters offers a complete mobile app testing solution that includes a management tool (platform), and a crowd testing solution (service). The platform is a comprehensive, easy to use, cloud-based, process management tool for mobile applications beta testing to manage the in-house QA team and internal processes.

Crowdtesting services:
Link: https://ubertesters.com/need-testers/
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Software testing:
Localization testing - https://ubertesters.com/localization-testing-services/
Usability testing - https://ubertesters.com/usability-testing-services/
Functional testing - https://ubertesters.com/functional-testing/