Ac Browser Plus is a file manager for windows, with integrated image viewer and converter, FTP client, file finder, and encryption/compression/mass renaming tools.
Other features include for example folder synchronizer, "editorial renaming" (renaming files just like in a text editor), true multi-threading, calculating folder sizes "on fly", instant preview of image and multimedia files, file splitting and merging, simple script engine, zooming in/out thumbnails and other views (with Ctrl+mouse wheel), or file operation queueing.

key features:

-Integrated FTP client.
-Folder synchronizer tool working with local, network, FTP and zip folders.
-Quick viewers. View and edit text, and image files straight from the file manager! You can also convert images to another type (supported jpg, png, tiff, gif, bmp, pcx, ico), change the resolution and other characteristics (more about image viewer)
-Batch renaming. Rename bunch of files with a few clicks
-Zip as folders, packing, unpacking with ease, implemented into the file manager itself. Searching in archives, and in nested archives (archive in archive). More archiving functions built in the file manager.
-Adding comments to files and directories.
-Editorial Renaming. Rename files with ease, just like in a text editor.
-Script templates. You can write scripts (visual basic scripts, batch scripts- .bat, or anything else), which can be executed in the context of currently selected files or folders (thanks to the script templates). More: Creating vbs or bat scripts for ACB.
-ACFAT - locate files in a second! This service can index a chosen drive, and so you can query this index in a second, more: drive indexing.
-Multi Window Interface. This makes this file manager a really efficient tool. More.
-Smart Renaming. Rename file, e.g. "image.bmp" to "image"jpg" and the file will be converted.
-Hot Point – a small red rectangle on each file shows you the file properties, and quick view (images, text and multimedia).
-Supported Regular Expression while searching for files, text in files, and in a text quick view. So you can search for files using e.g. r[eo]d which matches red and rod. Or [0-9]*[0-9] – matches any text beginning and ending with one digit. More.
-Quick Access Bar – Displaying most frequently used folders and allowing you to filter out items from current file browser window, more.
-Threads, threads – most of the operations – copying, moving filedirectory ,deleting, searching, file finder, even calculating space occupied by a directory – all of these are new threads, which means you can continue your work.
-List of files – you can create and save a document – Ac Browser Plus' list of files to reuse certain groups of files and folders.