This week's book giveaway is in the OCAJP forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide 1Z0-808 and have Jeanne Boyarsky & Scott Selikoff on-line! See this thread for details.
The most basic difference between Tomcat and Weblogic is that tomcat is a servlet container and Weblogic is a full-featured J2EE server. Weblogic also has a number of tools to facilitate the development, deployment and maintainance of applications.