Application-building framework built on top of Ruby on Rails, authored by Adrian Marin, that helps developers build admin tools roughly 10× faster. Magic-heavy: discovers models by eager-loading the app and picking descendants of ApplicationRecord from the object space, then auto-generates a UI around them. Avo itself ships no models — it hooks into the host app. Acceptable only if it can be wired to service objects or commands instead of models; good for shippers who want to ship quickly. Available at avohq.io. Distributed as a Rails engine — the packaging pipeline for Avo is the running example of Adrian's wroclove.rb 2022 talk. Nick Sutterer suggested at wroclove.rb 2022 that Reform could be a strong replacement for Avo's own form engine.