Depending on what you are looking for, a "Toolkit .rar" could be one of the following:
Various technical tools, such as the MVS Toolkit for web service export/import or inventory management apps like The ToolKit , are often distributed in compressed formats. Security Risks and Vulnerabilities Download Toolkit rar
Software provided by drive manufacturers to manage data backups, security settings (like AES 256-bit encryption), and RAID configurations for external storage. Depending on what you are looking for, a "Toolkit