Living Web Farms has a number of valuable videos for the small scale farmer, homesteader, even home gardener. This workshop focused on no-till methods for small scale farms. It includes a demonstration of a small no till seeder running behind walk behind tractor, but there is discussion of their having done a version they run behind a donkey. This is a made in America product, intended for third world use, primarily, but perfectly well suited to small scale farming here.
side note, when you watch the video, ignore Patrick's scythe technique

- it's terrible