You can see the list of all Azure Free Services in Azure Portal. You can create a free Account for Azure to get started. The Azure free account includes access to several Azure services free for 12 months, $200 credit to spend for the first 30 days of sign up and access to more than 25 Azure Services that are always free.
List of all Azure Free Services in Azure Portal
With your Azure free account, you can see a list of all free accounts and services from here with the time frame.
The interesting part is, You can find out the same from Azure Portal as well. From the Azure Portal Search option, search for “Free Service”
This list out all the available free services for time frames as well the services which are free always.