Windows
AccuSplit, AETSplitZ, Copy-Zit, CyberSoft PhileSplitter 2003, Dariolius - KanastaCorp, File Splitter, File Splitter Deluxe, Fsplit v.1.01 File Splitter, JoneSoft Software, JR Split File
Chop
TAssembly Language program for splitting large files (up to 4GB) for easier distribution. Files can be split by either the number of files specified, the maximum file size, or use preset common sizes for floppies and CDs.
File Split Program - Datei-Zerstückelung
Splits a large file into smaller pieces, uses Cyclic Redundancy Check (CRC), and auto-concatenate. [Bilingual site German/English]
Gair Software
Utility for splitting large files into several smaller parts, developed for the Microsoft .NET platform.
Goetz's File Splitter
Split a large file into smaller files to fit on floppies or e-mail attachments. Command-line tool.
Smartcopy
Shareware file utility for splitting and restoring large files, for Windows and Dos. Features a handy built-in file and directory browser/selector.
SplitIt!
Macintosh freeware to split a file into pieces of any size then reassemble it.
Splitpea
Command-line tool written in Python that can split a file into multiple fixed-size pieces and join those pieces to form the original file. Runs on Linux and Windows. GPL from dOxxx.
Splittur
Shareware file splitter that can create spanned or single-volume self-extracting (SFX) packages. Integrated ZIP extraction, encryption, possibility to make every volume executable.
Steve's File Splitter
Free Tcl/Tk graphical file splitter, with source code. Generates .bat file to rejoin parts on DOS or any Windows OS.