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Language OS Hybrids :: Languages
Extensible :: Operating Systems
Microkernel :: Operating Systems
Open Source :: Operating Systems
Research :: Operating Systems

dr'ex - Exokernel written in C/asm for the x86 architecture. Released under GPL.

dr'ex: SourceForge - Information, news, forum, CVS, downloads. [Open Source, GPL]
Meta Description: [ The world's largest development and download repository of Open Source code and applications ]

Elysium - Main idea: enforce no abstractions, rather, have them as options, to all levels of system: hardware, kernel and file services, ways users interact with system; based on exo principles. Descriptions, news. [Open Source]

404 Exokernel: An Operating System Architecture for Application-Level Resource Management - Summary of paper mentioning overview and design issues.

Exokernel: An Operating System Architecture for Application-Level Resource Management - Traditional OSs limit application performance, flexibility, functionality by fixing interfaces and implementations of OS abstractions such as interprocess communication and virtual memory. Exokernel address this via application-level management of physical resources. [ResearchIndex]
Meta Description: [ We describe an operating system architecture that securely multiplexes machine resources while permitting an unprecedented degree of application specific customization of traditional operating system abstractions. By abstracting physical hardware resources, traditional operating systems have sign... ]

Miranda - Planed features: Exokernel architecture, object-oriented, POSIX compliant, intuitive GUI, and best technologies: journaled main filesystems, LibOS modular library. Development documentation. [Open Source, LGPL]

Miranda: SourceForge - Downloads, announcements, and a forum. Programming languages: Assembly, C, and C++.
Meta Description: [ The world's largest development and download repository of Open Source code and applications ]

miray Software - Makes µnOS: 72k microkernel on 8k nanokernel client/server architecture based on OOP framework, symmetric multithreading, multitasking, priority based scheduling, fully interruptible, separated address spaces, and full memory protection. Free download.
Meta Description: [ Miray is the manufacturer of the embeddable RTOSes Sphere and µnOS and the software tools HDClone, HDShredder, PCISniffer, DiskSpy, DiskCheck and NetSniffer. ]

MIT Exokernel OS - Puts applications in control, runs 10x or more faster. Exopc and XOK versions run on x86 PCs. ExOS library gives user-level extensible implementation of Unix OS, so most applications compile and run with no change. Download. [Open Source, MIT]

TUNES Project: No-Kernel - Unique description of operating systems without kernels, links.

Unununium Operating Engine - Claimed as radical new approach to OSs: no-kernel, self-modifying cells (like objects); single address space, useful where memory and CPU power is low, and maybe for AI. Written in self-modifying, modular assembly language. [Open Source, BSD]