Procore - Procore is the world's most widely used construction project management software. Easy to use, mobile platform with unlimited user licenses.
Okular - Okular is a universal document viewer based developed by KDE.
BuilderTREND - Buildertrend is the #1 construction management software and construction app for home builders, remodelers, specialty contractors and commercial construction.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
CoConstruct - CoConstruct's project management software helps custom builders & remodelers coordinate projects, communicate with clients & crew, and control.
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.