Adobe hase rebranded their services around electronic signatures which were called Document Cloud eSign Services (formerly EchoSign) into Adobe Sign.
In the next couple of weeks new versions of the corresponding applications (Acrobat/Reader DC for MacOS and Windows, Reader Mobile, Adobe Sign for iOS and Android) as well as an update of the web service will be released. Adobe Sign will also be integrated in the Adobe Marketing Cloud.
Adobe Sign is available in three subscription plans. For qualified signatures (based on certificates) the Enterprise plan (serveral thousand Euros/$ per year) is required!