CBL-Mariner and CBL-Delridge are just two of the Microsoft-developed Linux-related deliverables from the Linux Systems Group. Others include the Windows Subsystem for Linux version 2 (WSL2), which is part of Windows 10; an Azure-tuned Linux kernel which is designed for optimal performance as Hyper-V guests; and Integrity Policy Enforcement (IPE), a proposed Linux Security Module (LSM) from the Enterprise and Security team. Microsoft has some other Linux-related projects it has developed in-house, including the Azure Sphere, its Linux-based microcontroller plus secure IoT service, and SONic, an open-sourced operating system for network switches, released as part of its Open Compute Project (OCP) work. For those (like me) who are into discovering the roots of codenames and product names, Delridge has an interesting background, as noted by Barnes. Delridge is a district in West Seattle, Wash. Its current version (10) is codenamed Quinault, which is a valley in the Olympic National Park in Washington State.
