To stay up to date with the latest developments in the AI industry and identify top AI development companies, you can regularly follow technology news sources, industry reports, and rankings with https://www.gate2ai.com/chatgpt-plugin site there. Some well-known companies in the AI space as of my knowledge cutoff include OpenAI, Google DeepMind, Microsoft AI, IBM Watson, and Amazon AI. However, the landscape is constantly evolving, and new companies may emerge with groundbreaking innovations in the field of AI.