1. User-Exits beginning with ITOB means search with string ITOB*. It is as simple as that.
2. As told earlier User-Exits begin with Package, So you need to use SE93 to know the package.
3. You can search via SMOD tcode also by giving Package*. (Example ITOB* or IEQM*)
4. These are the options for your query of User-Exits beginning with ......
5. If your search area is broader , Example: You want to know what are the User Exits available in Plant Maintenance, Quality Management etc, there is lot of information get in Google. Searchusing search strings like: Enhancements in SAP Plant maintenance, User-Exits in SAP Plant Maintenance etc.
Jogeswara Rao K