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In addition to data sources built in natively to Wyn, your developers might make available custom data sources under the Custom section in the Create Data Source page in the Resource Portal. Different sources might be available to you than the custom data sources you see in the pages below.
Custom data sources are created like built-in data sources from the Resource Portal. Press the + sign.

If the admin has deployed any custom data sources, they will be under the custom section in the data sources list. Here, i have three custom data sources, but different data sources with different icons will be available to you in Wyn.

In the screenshot above, there are three types of custom data sources. Refer to the articles below for more details on how to use each type of them.
Connect to a .NET Custom Data Provider