Digibell.io is described as 'Digibell is a smart bell requiring no installation or hardware other than a smartphone & a QR code' and is an app in the Social & Communications category. There are more than 50 alternatives to Digibell.io for a variety of platforms, including Online / Web-based, iPhone, Android, iPad and SaaS. The best alternative is UseResponse. It's not free, so if you're looking for a free alternative, you could try UserReport or Survicate. Other great apps like Digibell.io are Nolt (Paid), Zendesk (Paid), Get Satisfaction (Paid) and UserVoice (Paid).
Astuto is a free, open source, self-hosted customer feedback tool. It helps you collect, manage and prioritize feedback from your users. It has been heavely inspired by Canny.io ("astuto", indeed, is the italian translation of the word "canny").
IntraService will allow you to bring your customer support to the brand new level with minimal costs. The system is extremely easy to set up and use and is compatible with ITIL; it can be implemented in a single day as a SaaS model or as self-hosted solution.
RenegadeWorks combines customer feedback, online reputation management, customer referrals and other tools to drive new and repeat business. The software allows businesses to build a new customer database, or upload their own.