LetterDrop is an open source alternative to FormKeep that is easy to self-host.
$ cp .env.example .env$ docker run -d \ -p 5432:5432 \ -e POSTGRES_USER=letterdrop \ -e POSTGRES_PASSWORD=letterdrop \ postgres:10$ go run .https://github.com/golang-migrate/migrate/tree/master/cli#installation
$ migrate \ -path=migrations \ -database=postgres://letterdrop:letterdrop@localhost:5432/letterdrop?sslmode=disable \ up$ PGPASSWORD=letterdrop psql -h 127.0.0.1 --user letterdrop <<EOF insert into users (name, email, password_digest, is_email_confirmed) values ('admin', lower('admin@letterdrop.com'), crypt('keyboardcat', gen_salt('bf', 8)), true) returning * EOF