On-line Tools for Schoolwork

Could you suggest online tools specifically tailored to promote effective group work and collaboration among students at [insert grade level]? I'm interested in platforms or applications that facilitate seamless communication, task allocation, and cooperative problem-solving. By leveraging these digital tools, we can enhance students' ability to work together, share ideas, and collectively achieve project goals, regardless of physical proximity. Please provide recommendations that prioritize user-friendly interfaces and features that foster engagement and productivity in group settings.