BuilderKit is a highly modular NextJS AI template that allows developers to quickly build and launch AI applications. It saves over 40 hours of development work by providing pre-built apps and a powerful deployable code library. BuilderKit supports all major AI models and workflows, including GPT-4, Whisper, and Deepgram, and offers AI modules including authentication, payment, and email integrations. Additionally, it provides 10 pre-built AI applications, as well as login pages and waiting list pages, to help developers get started quickly.