Free DAWs/Applications/Utilities

VSTHost (Windows)
Standalone VST Host. Good for using VST's live without the overhead of running them through a DAW

SAVIHost (Windows)
Similar to VSTHost above, but only loads a single VST

Audacity (Mac/Windows/Linux)
Basic Audio Editor

PreSonus Studio One Free (Mac/Windows)
Digital Audio Workstation

Ardour (Mac/Linux)
Digital Audio Workstation

Rosegarden (Linux)
MIDI Composition and Sequencer

Zynewave Podium Free (Windows/Mac)
Digital Audio Workstation

VirtualDJ (Windows/Mac)
DJ Software

rtpMIDI (Windows)
Send and receive MIDI via WiFi

LMMS (Windows/Mac/Linux)
Digital Audio Workstation

MuLab (Windows/Mac)
Digital Audio Workstation

Tracktion Free (Windows/Mac/Linux)
Digital Audio Workstation

Aria Maestosa (Windows/Mac/Linux)
MIDI Editor/Sequencer

 

Free VST Instruments+Effects

kvraudio.com/plugins/free/newest

dskmusic.com

vst4free.com

splice.com/plugins/free_plugins#!

vstplanet.com

pluginboutique.com

gtgsynths.com/plugins.htm

vstwarehouse.com

native-instruments.com/en/specials/free-vst-instruments-and-effects

www.amvst.com

free-plugin-list.com

sadglad.com/freevstplugins6.html

users.tpg.com.au/billv/free_vst_plug-ins.htm

tweakbench.com

shuttlebugrecords.com/Pages/shuttleplugs.htm

myvst.com/vst-instruments

hiphopmakers.com/category/music-production-resources/free-vst-instruments