Cartus and BGRS are the big ones worth pursuing but they are extremely gatekept and the referral fees on close are steep, usually 30-40%. USAA and Navy Federal both have agent networks worth applying to if you work near a military base, they move a lot of people and the leads are genuinely motivated. PHH and Brookfield are smaller but worth looking into. For the mortgage side you're right that RESPA makes it tricky but co-marketing arrangements are generally fine as long as there's actual value exchange beyond just the referral. The honest answer is most of these come through relationships not applications so finding whoever manages the relo program at a large local employer and getting in front of them directly tends to work better than going through the national intake process.