Visio Replacement
Visio 2013 MS Viewer free
http://blogs.office.com/b/visio/archive/2012/11/28/download-the-free-microsoft-visio-viewer.aspx
Also compares the Visio Viewer to Visio Services (part of Office 365/Sharepoint)
You can also go for online Visio with office 365
Visio Online permits the adding and sharing of diagrams, but it currently doesn't let users edit diagrams. Instead, users need "Visio 2013 or Visio 2016 desktop applications,"