Germany is known for producing high-quality and technologically advanced CNC machines, and many of them are well-known and widely used in various industries worldwide. However, the best-selling German CNC machines can vary depending on the specific application, industry, and region. Here are some popular and widely used German CNC machine brands and models:

1. DMG MORI CNC machines – DMG MORI is a leading German brand in the CNC machine industry, known for their high precision, reliability, and durability. They offer a wide range of models for different applications and industries, such as machining centers, turning centers, and grinding machines.
2. Hermle CNC machines – Hermle is another well-known German brand in the CNC machine industry, known for their high precision and efficiency. They offer a wide range of models for different applications and industries, such as machining centers and milling machines.
3. Trumpf CNC machines – Trumpf is a well-known German brand in the CNC machine industry, known for their high precision, productivity, and innovative technologies. They offer a wide range of models for different applications and industries, such as laser cutting, bending, and punching machines.
4. Grob CNC machines – Grob is a well-known German brand in the CNC machine industry, known for their high precision and flexibility. They offer a wide range of models for different applications and industries, such as machining centers and turning centers.
5. DMG Deckel Maho CNC machines – DMG Deckel Maho is a well-known German brand in the CNC machine industry, known for their high precision, reliability and easy maintenance. They offer a wide range of models for different applications and industries, such as machining centers and milling machines.

It’s worth noting that the best-selling German CNC machines also depend on the region, some brands might be more popular in one region than another. Also, the best-selling models change over time as new technologies and models are introduced, so the list above may not always be the most up-to-date.