Free Software

DAW's
 
LMMS, produce music with your computer by creating melodies and beats, synthesizing and mixing sounds, arranging samples and much more.
Ardour is an open-source alternative to the likes of Pro Tools, Cubase and Logic. A fully-fleshed out, mature DAW with all of the trimmings, Ardour began life as a Linux program before being ported to OS X and now, in version 4, Windows. 
Mixpad multi-track recording and mixing software, a free version of MixPad is available for non-commercial use only

Samplers

Samplv1 is an old-school all-digital polyphonic sampler synthesizer with stereo fx.
TX16Wx is one of the most comprehensive and best updated free samplers you’ll find. Based on Yamaha’s rack-mounted TX16W sampler.
Decent Sampler  

VST's

Cecilia is an audio signal processing environment aimed at sound designers. Cecilia mangles sound in ways unheard of.
Soundgrain is a graphical interface where users can draw and edit trajectories to control granular sound synthesis.
TAL-NoiseMaker is new synth engine with lots of improvements in sound and usability.

(Download the Layers Free Orchrestal Pack)

Spitfire Audio (BBC Symphony Orchestra Discover)
Create account download software, go back to spitfire on your browser, search BBC Symphony Orchestra Discover, are click the link below and complete the survey, you have got yourself a free copy worth €49  Spitfire Audio — BBC Symphony Orchestra Discover











DJing

Mixxx has everything you need to start making DJ mixes in a tight, integrated free package.
Giada is a minimal production environment designed for DJs and live electronic musicians
 

Audio Editing

Audacity is free, open source, cross-platform software for recording and editing sounds.
 
Effects/Processing

MFreeEffectsBundle is worth a look. The 25 utilities range from a simple noise generator and phaser to a six-band equaliser.
TAL makes some solid free effects too. Not all are currently supported, but its Reverb, Filter and Vocoder all do exactly what they’re supposed to, albeit with no frills.
DC1A is free compressor/saturation tool.
Voxengo’s SPAN is one of the best, with a clean, colour coded interface and the option to view spectrums from two different channels at the same time.
TDR’s VOS SlickEQ is one of the best free offerings, with a foolproof interface.








Waves free plugins

Metering/Mastering

Youlean Loudness Meter helps you find the true perceived loudness of your audio and prepares it for TV or streaming services release.

iZotope Elements is a carefully selected collection of products designed to give you everything you need to mix, master, and repair.

Voxengo Span free fft spectrum analyzer

Graphics
  
Gimp  is a freely distributed piece of software for such tasks as photo retouching, image composition and image authoring. It works on many operating systems, in many languages  

Shotcut is a free, open source, cross-platform video editor.



Documents

LibreOffice is a free and powerful office suite.