Here is a list of new-ish web services that so far haven't been documented. But hopefully, their titles will be enough to let you know if a functionality you are looking for exists. And you should you want to use one of them and would like information about parameters etc. just raise a Question with us and we'll be only too happy to find the information for you.
ADDUNIQUEUSER
ADDUSERSIGNOREDUPLICATES
ADDUSERSIGNOREDUPLICATES
ASSIGNDEFAULTDASHBOARD
DELETECATEGORY
DELETEROLE
DELGEOPACK
EXCLUDEUSERSFROMGROUP
EXPORTTRANSLATIONALL
GETALLUSERS
GETCATEGORIES
GETDRAFTCATEGORIES
GETIDFORUUID
GETUSERDRAFTPARENTTABS
GETUSERDRAFTPARENTTABSWITHREPORTS
GETUSERDRAFTREPORTS
GETUSERDRAFTTABS
GETUSERDRAFTTABSWITHREPORTS
GETUSERDRAFTTABSWITHREPORTS
GETUSERPARENTDRAFTTABSWITHREPORTS
GETUSERPARENTTABS
GETUSERPARENTTABSWITHREPORTS
GETUSERPARENTTABSWITHREPORTS
IMPORTCONTENTNOVALIDATION
IMPORTTRANSLATION
INCLUDEUSERSINGROUP
LOADCONFIGURATION
LOADCUSTOMPARAMETER
METADATASQLQUERY
REJECTREPORT
REMOVECONTENTMANAGEMENT
REMOVEFAVOURITES
RESETPASSWD
SAVECONFIGURATION
SAVECUSTOMPARAMETER
SAVEROLE
TABSFROMPARENTGROUPID
TESTIMPORTCONTENTNOVALIDATION