Deadly Crusaders WotLK is a free to play Wrath of the Lich King 3.3.5a realm called Nezzerath. No subscription, no queue, no pay to win.
Nezzerath runs AI player bots that quest, level, travel and fight alongside you, so the world is never empty and you are never stuck waiting on a group. Solo the whole game if that is what you want, or bring friends and do it together.
Rates sit close to the original game where it counts. Experience is 5x and drops and gold are 21x, but reputation, honor, talents, arena and rested experience are all left at Blizzlike values. If you remember how Northrend actually played and want that pace back, this is your realm.
We also run Legion and Dragonflight realms, each listed separately. Game masters are real people who answer, we push custom updates and fixes regularly, and the realms are monitored around the clock with automatic restarts, so downtime is measured in minutes.