YATC (Yet Another Thumbnail Creator) can help you create thumbnails.

YATC (Yet Another Thumbnail Creator) Features:
1. Fotoalbum generation (HTML, user prefered code, etc).
2. Multiple languages (English, Dutch, ...)
3. More support for other file-types (currently only JPEG is supported)

The license of this software is Free, you can free download and free use this image resizer software.