Tools
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CScope
Terminal-based source code browser.
Links
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ACM SIGOPS
ACM Special Interest Group on Operating Systems
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Secure Virtual Architecture
Secure Virtual Architecture enforces security properties on commodity operating system kernel code. The source code release includes KCoFI (which enforce control-flow integrity on kernel code) and Virtual Ghost (which protects applications from a compromise operating system kernel).
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Plan 9 Operating System
Plan 9 is an operating system from Bell Labs that attempts to improve upon the Unix philosophy.
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Singularity
Singularity is a research operating system from Microsoft Research that is written in a type-safe language. Note the small link that takes one to the URL for downloading Singularity.
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Intel Architecture Reference Manual
This manual describes the Intel 32- and 64-bit architecture in detail.