Question: Looking for a customizable collaboration tool that prioritizes focus, adaptability, and resilience for large enterprises with stringent security requirements.

For a customizable collaboration platform that focuses on focus, flexibility and resilience for big businesses with serious security needs, Mattermost is a good choice. It's geared for defense, government and critical infrastructure companies, with built-in security operations, real-time DevSecOps and other security controls. The platform is highly customizable and adaptable, working in on-premises, air-gapped, private cloud and public cloud environments, so it's flexible and secure.

Another contender is ClearGPT. This enterprise AI platform uses generative AI and Large Language Models to offer secure and customizable internal enterprise use. ClearGPT has zero data leakage and maximum control over corporate IP, with features like role-based access, data governance and integration with existing applications. It can help automate tasks, boost productivity and improve products through AI, while maintaining strong security and compliance.

Another contender is Langdock. It offers AI-powered tools to help teams work more efficiently and is certified to GDPR and ISO 27001 standards for data security. The platform offers customizable assistants, workflow automation and AES-256 data encryption for good data protection. Langdock has tiered pricing and can be deployed in SaaS, single tenant and dedicated instance configurations, so it's adaptable to different enterprise needs.

For those who want an all-purpose content management and collaboration platform, Box is a good choice. It's got sophisticated security controls, intelligent threat detection and complete information governance. Box enables secure collaboration, workflow automation and integration with more than 1,500 popular apps. The platform also includes AI-powered insights to help teams work more efficiently, so it's a good all-purpose choice for businesses of all sizes.