If you're looking for something to replace Book Title Generator, Novelcrafter could be worth a look. Novelcrafter is a full-featured novel writing tool that includes a full writing environment and AI tools to help you get started and finish your book. It's got a personal Wiki (Codex) for storing and tracking story information, multiple writing modes and customizable tags and labels. It's geared for both planners and pantsers, so it should be adaptable to your writing style.
Another tool is AIContentfy, an AI content creation platform that automates and streamlines SEO content creation. It's got tools for keyword research, AI content generation, content optimization and meta descriptions. The tool is integrated with a variety of content management systems (CMS) and offers features like batch article generation, auto-publishing and analytics tools to track article traffic and SERP ranking. That could be useful for authors who want to optimize their book's online presence for discoverability.
Although these alternatives don't specifically focus on book title generation, they do offer writing and SEO tools that can help you with your writing and get your book more visible online.