Novel OS Work
By Christopher Browne. Very brief, clear descriptions and some critiquing of many OSs, mostly research types, with many links. Puts much current activity in larger context.

comp.os.research FAQ
Table of contents, points to questions.

FunOS
Proposal for LISP oriented OS based on Assembly, Caml, FunScheme, a Scheme variant of LISP language.

HOPE: Hopefully Optimistic Programming Environment
A Programming Model for Optimism. Latency is being held back by the speed of light, more so in distributed systems. Optimistic algorithms 'guess' results of operations and proceed in parallel with confirmation of the guess; an effective way to hide latency of slow operations with predictable outcomes.

Hydra
Early capability-based OS kernel for multiprocessing environments, gave fine-grained protection. Goals: universal applicability, absolute reliability.

Research Operating Systems
Short, annotated, alphabetically sorted list and links, part of larger system.