Skypocalypse: SkypeKit - RIP; Login from old versions of Skype - RIP.

SkypeKit is a set of tools for creating your own UI for Skype or for integrating it into third-party messengers (there was integration into Trillian, for example). Starting next week, all applications written using it will stop working. Last fall, they stopped supporting API and closed the app store. Now disconnect and SkypeKit.
Fragment of the original letter:

As previously communicated, all support for SkypeKit ended on July 31, 2014. No further updates to SkypeKit SDK will be available.
In addition, we’ve made a decision that from 4 August, 2014 we will be permanently retiring the SkypeKit SDK. Thanks to the functionality of your SkypeKit-enabled application via your application.

Also today, all the old versions of Skype have stopped connecting. Totally.