Third Party Support 
Rimini Street offers Siebel Software licensees an alternative maintenance & support program, providing fixes for serious application issues with a guaranteed response time in 30 minutes or less 24x7 at less than 50% of the current cost.
http://www.riministreet.com/peoplesoft.htm
Third Party Support          Rimini Street offers Sieb     Rimini Street offers Sieb

Legacy system migration testing 
Acutest UK provide independent services to test migration of application functionality or data from legacy systems. Also provies software testing and quality assurance training courses.
http://www.acutest.co.uk