I noticed that Homewood at Tahoe has a long list of partners providing 2-5 days of lift tickets to season passholders. Plattekill is on the list. Sure enough when I checked the Plattekill website, Plattekill passholders can get a few days at Homework if they head out to Tahoe. Plattekill is on the Freedom Pass.
The Homewood list is a mix of Freedom Pass and other locations. Diamond Peak, Snow King, Ski Cooper on their list, which are not on Freedom. I'm guessing these partnerships were arranged before the Indy Pass was well known. Mission Ridge, Loveland, Red Lodge (unlimited), and perhaps Whitefish are the larger areas/resorts that might be a draw for Tahoe locals to spring for a Homewood pass. Mission Ridge and Red Lodge are on Indy.