not open source but free, windows only (well i didn't try yet to see if works in linux with wine)
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This program is an image viewer that display the images as a mosaic, using the image like a tile texture. Some of its features are:
Shows the images as a mosaic, using the loaded image as the 'tile'.
Provides commands for manual slide show of all the images in a folder.
Full screen mode, with easy shortcut keys for all the operations.
Support for multiple image formats:
JPEG images (*.jpg, *.jpeg, *.jfif)
GIF (CompuServe) images (*.gif)
PNG (Portable network graphic) images (*.png)
TIFF images (*.tif; *.tiff),
Windows Bitmap images (*.bmp, *.rle, *.dib)
Photoshop images (*.psd, *.pdd)
Kodak Photo-CD images (*.pcd)
Portable Pixel/Gray Map images (*.ppm, *.pgm, *.pbm)
And many more
Zoom in and zoom out control.
Option of showing a grid that delimitates the tile boundaries.
Can save and/or copy the displayed mosaic image.
DOWNLOAD
http://www.ampsoft.net/utilities/TileViewer.phpand there you will found also a good and free font manager ---without a font manager more the fonts you have installed less the chances to find that you may need...for sure the gimp font choser widget can't help much except if you already know the name of the font you wish
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Description
This program is an easy to use but powerful font manager, which allows you getting a quick overview of both installed and non installed fonts. It can install and uninstall fonts, and organize them in categories. Some of its features are:
Supports TrueType and OpenType fonts.
Supports Type1 fonts.
Installation of fonts from a folder (one by one or from a list).
Installation of fonts temporally (until the program is closed).
Deletion of installed fonts.
List of all installed fonts with several display options.
List of the fonts from a folder with several display options.
Several options for organizing fonts in categories and managing them.
It can print a list of all or some of the installed fonts with an example of each font.
Scratchpad area for testing the look of any font (installed or from a folder).
Dual English/Spanish version.
Download
http://www.ampsoft.net/utilities/FontViewer.php