The NHL Network US will be broadcasting the TSN coverage of UFA day from noon ET - 5:00pm then goes in-house with their own coverage at 5:00pm.

In Canada, from TSN...

We track every move throughout one of the NHL's most pivotal days with a full day of Free Agent Frenzy coverage today. Live coverage begins at Noon et/9am pt on TSN2 when the free agent market officially opens for business and then continues at 2pm et/11am pt on TSN.

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Also, here is a UFA Tracker from TSN which will allow you to follow-up on all the signings. Sportsnet has one too.