files
Help to manage your files
Renaming multiple files and folders at once to change the names, attributes, and timestamps with scripting support.
Allway Sync 
Multi-purpose file sync supporting bi-directional and n-way files and folders, synchronization history, multiple file systems, intermediate devices, etc.
Highlight file differences: source code, folders, images, etc.
Dukto 
Open source file transfer
Duplicate file searching that supports sub-folders & MD5
FastCopy
The Fastest Copy/Delete Software on Windows.
Advanced renaming tools with everything you need for renaming
FTP, FTPS and SFTP client.
FreeFileSync
An easy backup solution for files and folders, It supports mirroring/two way sync/update between source and destination.
Hasher
Hashing utility for verifying integrity of files using a wide range of supported algorithms: CRC32, MD2, MD4, MD5, SHA1, SHA256, SHA512, RipeMD128, RipeMD160, ED2K.
HashTab
Calculate and display hash values in a tab on file properties window
MediaCoder 
Free Universal multimedia converter
Meld
Visual diff and merge tool that helps you compare files, directories, and version controlled projects.
Pandoc
A universal document converter.
Powerful and flexible file renaming tool, which offers all the standard renaming procedures, including prefixes, suffixes, replacements, case changes, as well as removing contents of brackets, adding number sequences, changing file extensions, etc.
Complete resource editing tool for any type of Windows executable (*.exe; *.dll; *.scr; *.mui etc).
rimraf 
A deep deletion module for node. Help to delete files and folders with very long paths.
SHAREit 
Cross-platform files transfer.
Lets you understand how folders and files are structured on your disks by using a treemap visualization layout for immediate perception of where big folders and files are placed on your devices.
Syncthing
A continuous file synchronization program to synchronize files among multiple computers safely & sucrely without cloud server.
TeraCopy
Copy your files faster and more securely, help with copy error and file verification with drag'n'drop support.
Waltr
Transfer any movie or music file to your iPhone w/o iTunes.
An Open Source differencing and merging tool for Windows