MultiSkype

MultiSkype enables you to launch multiple instances of Skype and thus, manage multiple accounts from the same computer. There is no limit to the number of instances you can initiate with the help of this application.

Run more than one Skype instance

Skype is configured to only allow one instance at a time to be launched, which is a great inconvenient to users who own more than one account. Delivered inside a lightweight package, this application can bypass this restriction, enabling users to access all their accounts at the same time.
Alternatively, this can easily be achieved without using third party software, by running a simple command in the console ('"C:\Program Files\Skype\Phone\Skype.exe" /secondary'), which permits you to launch a secondary instance of Skype and login with your credentials.
MultiSkype is just as difficult to use (since it also forces you to work with the command console), but it has the advantage that you can add as many accounts as you want and launch a Skype instance for each.

Unlimited number of accounts

In order to use it, you first have to execute the application with the parameter "U" in the console. This will open a form where you can enter all your Skype username and passwords, which are stored inside a text file. For security purposes, passwords are automatically encrypted.
Once you close the form, MultiSkype starts loading all your accounts, one by one, opening a new Skype window for each.

Manage all your Skype accounts simultaneously

Launching more than one Skype instance can be done in various ways and there are multiple third party applications out there that serve this purpose. Provided you have medium computer knowledge, it shouldn't be difficult to configure MultiSkype and access all your accounts at once.