Mendeley - Easily organize your papers, read & annotate your PDFs, collaborate in private or open groups, and securely access your research from everywhere.
ImBatch - ImBatch is a batch image processor with a nice graphical user interface.
Zotero - Zotero is a free, easy-to-use tool to help you collect, organize, cite, and share research.
Batch Image Resizer - Resize, crop, shrink, flip, exif-rotate, convert, enhance, process multiple pictures and photos with professional software! 120+ Actions, 30+ Image Formats
Qiqqa - Qiqqa is a free research and reference management software. It can be used in many organizational projects from the academic to the personal to the business endeavor. Read more about Qiqqa.
Ralpha Image Resizer - High-speed image batch conversion tool