There has been some confusion on which SharePoint ULS log viewer to use when troubleshooting SharePoint issues. In May 2010, I blogged about the SharePoint 2010 ULS Log viewer published by Microsoft (http://www.jeremytaylor.net/2010/05/03/sharepoint-2010-uls-log-viewer).
SharePoint 2013 Alert: In August 2014, I blogged about a re-released ULS Viewer for SharePoint 2013 enhanced by Microsoft.
Read more about it here: http://www.jeremytaylor.net/2014/08/27/uls-log-viewer-sharepoint-2013/
In this post, I have discussed all the ULS log viewer tools here with screenshots and my final verdict..