Some tools I did for Photoshop and Cinema 4D
All of those are free but if you want you can spare a penny, I'll buy myself a cake. Thanks!

Perspective tools 1.6.3 updated 24 july 2014
A panel or set of scripts for making vanishing points and orthogonal projections. Please see the video for detailed explanation.

Scripts 1.6.1 | CS6/CC Panel 1.6.1 | CC/CC2014 Panel 1.6.3 (install with Adobe Extension Manager)

Brusher updated 14 jan 2014
Brush panel triggered by hotkey. Detailed readme.

Scripts + amazing WYSIWYG editor from Petri Järvinen

PathSelect updated 16 mar 2014
Quick selections from paths.

Panel

DumbSymmetry 1.1.1 updated 28 nov 2013
Non-realtime symmetry tool. Please see the video for detailed explanation.

Scripts | Panel

Guider
Script will draw guides through bounding box or center of a layer.

Script

Shifty Select
Script will make rectangular or elliptical selection through bounding box of a layer.

Script

AxisToWorkplane
Script will center object's axis and orient it to Workplane.

Script

Pipoficator
Script will create a pipe along selected spline.

Script

Collapsoid
Script will collapse selected hierarchy and do Optimize..

Script

ExtrudeFillet
Script will close the current spline, create an Extude object with some controls for fast editing.

Script