You can install a plug-in in your browser (Google Chrome and Mozilla Firefox) called "NoFollow Simple". Once the link has converts into a strike through text then it is NoFollow, if it's not then it is DoFollow link.
you can use plugin to check do follow or no follow. Moreover its the easy way to find.
Check out this link
Try to Download Google or firefox dofollow tools.
To check, dofollow and nofollow in any website, one can either check its source code(ctrl f - nofollow - enter).
Another way to check is to add extension in Google Chrome, it'll tell you by highlighting the hyperlink, surrounded by a dotted link.
thanks for sharing Google and firefox dofollow tools.