BIM Vision - Freeware IFC model viewer.
Trimble Connect - Trimble Connect is a collaboration tool specially designed for Architecture, Engineering and Construction professionals such as architect, sub-contractors and project owners.
Solibri Model Viewer - Views Solibri Model Checker and IFC models on both Windows and Mac.
SmartBIM Platform - SmartBIM Platform is an all-in-one Building Information Management software that enables building product manufacturers to manage, edit and distribute building related content with ease.
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!
Blender - Blender is the open source, cross platform suite of tools for 3D creation.