Kit

ConvertKit is an email marketing platform and automation service aimed primarily at creators and small businesses. It provides tools for building email lists, creating landing pages and forms, automations, subscriber tagging and segmentation, and commerce features for selling digital products and subscriptions.

Kit for AI is a service that provides a persistent memory and grounded-knowledge layer for AI agents. It exposes APIs and native memory tools that let agents call stored knowledge directly, supports ingesting files and URLs, and is intended to avoid building a separate retrieval-augmented generation stack. The site states the product works with any model and offers a free-to-start tier.

LiveKit is an open-source framework and developer platform for building, testing, deploying, scaling, and observing real-time voice, video, and physical AI agents. Its agent pipeline streams user speech from an app, browser, or phone call to an agent, which applies custom business logic and returns a response; the platform supports automatic turn detection and interruption handling, speech-to-text, language-model, and text-to-speech providers, web and mobile applications, and telephony through phone numbers and SIP integrations. LiveKit Cloud provides deployment and scaling on LiveKit's real-time infrastructure, alongside an inference gateway and full-stack observability for agent sessions.

Substack is a newsletter publishing platform that can serve as the source for exporting an email list before importing it into another email platform.

Kittl is an AI-first online design platform for creating graphics, apparel designs, and other visual assets. It combines templates, AI image generation, editing tools, mockups, and curated design assets, and is used in template-based print-on-demand workflows.