Backlog is described as 'project management and collaboration tool for teams that want higher productivity, greater visibility, and simple project tracking. Development teams can work together with Design, Marketing, IT, and more to release high-quality projects, faster' and is an app in the Office & Productivity category. There are more than 50 alternatives to Backlog for a variety of platforms, including Online / Web-based, Mac, Windows, iPhone and Android. The best alternative is GitHub, which is free. Other great apps like Backlog are Bitbucket (Freemium), Redmine (Free, Open Source), Basecamp (Freemium) and JIRA (Paid).
This add-on helps to organize the collective work of both office management and visiting teams. If the location is a part of the issue where you need to gather information from, you can add map marks and have it all in a single place.