The sparkling wines use the 2 main grapes of Burgundy: Pinot Noir and Chardonnay. It’s a bit warmer in Bourgogne so these wines usually will have a ‘riper’ flavor than their bone-dry Champagne neighbors. If it says ‘Millésime’ it means it’s a single-vintage wine which usually has additional lees aging which is a technique practiced in Champagne.
Languedoc-Roussillon is the largest wine region of France and perhaps the oldest. Crémant Limoux is Chardonnay, Mauzac, and Chenin Blanc..
The region actually has records of their sparkling wine production since 1531 which is a few years older than Champagne.