awesome-ld-preload

angrymlocker

library for keeping corresponding process in memory

arg-inject

add support for config files

cleancache

drop files content from page cache after closing, useful for backups

flockit

add file locking to programs that don't do it

fluxcapacitor

a tool for making your program run without blocking on timeouts, on functions like poll and select

force-urandom

force programs to use fast and secure /dev/urandom instead of pointlessly slow /dev/random

fsatrace

filesystem access tracer

gamemode

enables optimizations for gaming that are automatically unset on process exit

ktlswrapper

enables TLS support for existing applications without code change

ld-preload-open

map files or directories to another location

libeatmydata

disable all forms of writing data safely to disk. fsync() becomes a no-op, O_SYNC is removed, etc

libfaketime

modifies the system time for a single application

libhugetlbfs

remap segments onto huge pages for a performance boost

libinput-force-middle-click-emulation

force libinput to emulate a middle click when pressing left and right buttons simultaneously

libkeepalive

enable TCP keepalive socket options

libleakmydata

disable SSL certificate verification

libnoxattr

disable all forms of extended attribute access

lkl

use modern Linux kernel on old Centos5/6 (2.6 kernel) machines

openssl-hook

log data to/from SSL_write/SSL_read to disk

otherport

redirect connections to other ports

preeny

redirect and to sockets; neuter , report constant , amongst others

srv-shim

drop-in DNS SRV record support for applications relying on getaddrinfo/connect/sendto

stderred

colorize all stderr output that goes to terminal thus making it distinguishable from stdout

timeskew

override time reporting in Linux processes (accelerate/slowdown games, test code involving timers/delays)

trickle

a userland bandwidth shaper

unrandom

make always use the seed 0

(Julia Evans)

(Jessie Frazelle)