What is a signing service?
Signing services provide pre-signed applications for users to install.
A paid signing service is recommended (namely AppDB), as most free signing services inject ads into their apps and often get revoked by Apple.
Signing services work on all versions of iOS, have no 7 day limit, and do not require a computer.
Paid Signing Services
AppDB (Recommended)
Signulous
IPAStore
UDID Registrations
Free Signing Services
Ignition.fun
iOS.Ninja
iOS Gods App