Shrink for Github - A macOS app for your Github issues
BIM Vision - Freeware IFC model viewer.
GitHub Reader - A quick way to browse GitHub issues and pull requests.
usBIM.viewer+ - Do you need to open an IFC file and modify it? usBIM.viewer+ is the only freeware certified by buildingSMART International that allows you to view, edit, convert and share BIM models in the IFC format. Basically, it is more than just a viewer!
Issue TODO (chrome extension) - Copy issues as TODO comments to paste in your code.
Tekla Structures BIM Software - Open approach to Building Information Modeling