First up, SaaS AI has a full Next.js starter kit that includes several AI services like OpenAI, LangChain and others. It also includes Supabase-based user authentication, Stripe integration for subscription payments and an SEO-optimized landing page. You can get it in two flavors: Pro ($199) and Starter ($99), both with lifetime updates and access to a private Discord community.
Another contender is Dream, a no-code tool for building web applications that uses AI to help you create and deploy web apps with no programming required. It has powerful integrations with services like OpenAI and Stripe, and one-click deployment to custom domains. It's a general-purpose tool, but you can use it to build a variety of web apps, like chatbots, landing pages and analytics dashboards.
If you want to focus more on lead generation and customer support, Rubber is a no-code tool that lets you build GPT-4-powered AI apps. It's got professionally designed templates, the ability to create your own UI and to integrate with ChatGPT. Rubber's pricing ranges from free to $30 per month, so it's got a place for a lot of use cases.