This topic covers the emerging ecosystem of enterprise AI agent platforms, agent marketplaces, and developer frameworks that organizations use to build, deploy, orchestrate, and govern autonomous and assistant‑style agents. As of 2025‑12‑05, enterprises are evaluating full‑stack offerings (ChatGPT Enterprise and managed programs from systems integrators such as Accenture) alongside cloud platforms and specialist vendors to balance productivity, compliance, and operational control. Key trends include consolidation of LLMs into enterprise suites (ChatGPT Enterprise, Microsoft 365 Copilot) and cloud ML stacks (Google Vertex AI, IBM watsonx Assistant) that offer both no‑code assistant builders and developer APIs for multi‑agent orchestration. Specialist platforms address vertical use cases — Observe.AI and Skit.ai for contact centers and compliance‑sensitive voice agents — while marketplaces and lightweight builders (Agentverse, AgentGPT) provide templates and discovery for rapid prototyping. Developer‑centric tools like Warp’s Agentic Development Environment integrate agent workflows into IDEs and terminals, accelerating engineering and observability flows. Practical distinctions to consider: no‑code assistants speed business adoption but can limit customization; cloud ML platforms provide model lifecycle, fine‑tuning, and governance controls; marketplaces accelerate reuse and discovery but introduce onboarding and security considerations. Systems integrators and managed agent programs (e.g., Accenture) remain important for complex orchestration, enterprise integration, and change management. Decision factors for 2025 deployments include data governance, model provenance, observability/QA for agent behavior, runtime orchestration across services, and support for voice and real‑time assist in contact centers. This landscape is pragmatic and rapidly evolving: organizations must weigh platform capabilities, vendor roles, and operational controls when choosing between integrated suites, specialist vendors, marketplaces, and developer frameworks.