MiniConsole

An alternate DOS / Windows console with customizable output colors.
Features:

Resizable log window
Lines matching Highlight strings are displayed in red
Instant search
Clikable URLs
Simple completion
Supports CTRL+C like in DOS
Remembers the last commands, working directory, window position and size

More info | Download (v1.0.2.0 | March 26, 2013)
Requires Microsoft .NET Framework 3.5

NetDebugPlot

Debug and visualize program internals with NetDebugPlot. Connect any local or remote program by plugging the ultra simple NetDebugLog C++ files into your source code.
Features:

Real-time line charts
Scale time and Y axis with scroll mouse or text boxes
Each series has its own color
Pause chart (data continues to be received)
Save chart to .jpg image
Change client's port number
Very simple to use

More info | Download (v1.0.1.0 | September 16, 2012)
Requires Microsoft .NET Framework 3.5

MiniPlot

Instantly plot data with MiniPlot. This software lets you type in or paste any number of data series and generate corresponding line charts on the fly.
Features:

Updates as you type
Automatically fits all series
Auto axis scale with window size
Each series has its own color
Chart types: line, point, column, area
Save chart as .jpg image
Copy image to clipboard

More info | Download (v1.0.1.0 | August 29, 2012)
Requires Microsoft .NET Framework 3.5

Photoshop Math GLSL Shader

Most famous Photoshop features for screen-space image manipulation in a GLSL pixel shader. Results are identical to Photoshop
Details and examples here.
Features:

All 29 layer blend modes (Lighten, Darken, Multiply, Overlay, etc.)
Levels: Input levels, Output levels, Gamma
Desaturation
RGBToHSL (RGB to Hue/Saturation/Luminance)
HSLToRGB (Hue/Saturation/Luminance to RGB)
Contrast
Used by:
- EyeEm (source)
- Ogre3D (source)
- NodeBox for OpenGL (source)
- OpenFrameWorks addon: ofxPSBlend (source)
- Xoliul-Shader 2 (source)
- NUI Paint (source)
- GLMixer (source)
- Anki 3D Engine (source)
- Lots of people...