grzegorz.blok 

FastRsyncNet by: grzegorz.blok
.NET library for file synchronization based on Rsync algorithm. Optimized for speed and data size to achieve best network performance.
ThumbnailsGenie by: grzegorz.blok
Creates thumbnails from images and several other file types (e.g. pdf, doc, xls). Images are resized and other file types are given proper, nice looking icon.