File Format Validator
FFV (File Format Validator) utility can quickly check format of text files, both fixed-width or delimited.
Text files (fixed-width or delimited) are often used for data exchange between various applications and FFV can help to check file's compliance with expected format before processing the file.
FFV is free to download and use.
Windows and Linux versions are provided bellow, Mac version will be available soon. Linux version is tested on Ubuntu 8.04 and Fedora Core 8 but it should work on any recent linux distro with libgtk2.0 installed.