AudiobookEditing.net provides human audiobook editing, proofing and ACX mastering for self-narrating authors, narrators and publishers, priced per finished hour. This page lists the main services and some free guides. Start with audiobook editing and production services.
Services
https://audiobookediting.net/audiobook-production-services/
Audiobook length and cost calculator
Guides: https://audiobookediting.net/guides/
Free resources
Editing, proofing and mastering explained