Few tools here , most if not all FREE , enjoy.
this one generates sound effects;
http://www.bfxr.net/
http://www.soundjay.com/
need to make a Gif file of some action on screen?
http://alternativeto.net/software/screentogif/
http://alternativeto.net/software/gifcam/
http://alternativeto.net/software/licecap/ view sample
Mind Mapping Tool;
http://freemind.sourceforge.net/wiki/in ... nd_install
online Photoshop;
https://pixlr.com/editor/
fonts?;
http://www.1001fonts.com/
http://www.dafont.com
Fancy Logo creation;
http://www.flamingtext.com/
http://cooltext.com/
http://megacooltext.com/
flow charts & Diagram makers;
https://www.draw.io/
https://www.gliffy.com/
state machine diagram editor;
http://madebyevan.com/fsm/ , example