We have different Forex providers, and all can be found under the Forex tab in the Symbol Search.
The difference between them is that ICE symbols are composite, meaning they consist of data received from dozens of contributors, while others are separate forex brokers. Also, volume data obtained from various brokers is different. For example, ICE symbols do not have volume data for daily resolutions, and Forex.com symbols do not have volume data for all resolutions, etc. Trading hours might also vary depending on the provider.