Final answer:
LibreTexts is an LCMS that allows for customization to meet instructors' needs by adopting and remixing existing materials, leveraging its web-based platform to integrate advanced features and technologies.
Step-by-step explanation:
Instructors looking for a flexible Learning Content Management System (LCMS) that can be tailored to meet an instructor's teaching needs should consider using LibreTexts.
The LibreTexts platform is designed to allow educators to either adopt existing materials or Remix them to create customized course-specific resources.
This customization is possible because LibreTexts is web-based, which facilitates the integration of advanced features and the latest new technologies to enhance the learning experience.