There was a download of MessagingToolkit 1.8.3.0 on the developer's website when we last checked. We cannot confirm if there is a free download of this software available.
The most frequent installer filenames for the software include: MessagingToolkit.MMS.Demo.exe, MessagingToolkit.BulkGatew.exe and MessagingToolkit.Core.Util.exe etc. The most popular versions of the tool 1.8, 1.3 and 1.0. This program was originally designed by TWIT88.COM.
The software lies within System Utilities, more precisely Device Assistants. We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software.
From the developer:
Messagingtoolkit is a .NET C# messaging library that can be used to send and receive messages using any ETSI 07.05 compliant GSM modem or phone connected to the PC serial port through serial cable, infrared or Bluetooth. It can also be used to send and receive MMS using MM1 protocol, and SMS using SMPP protocol.
You may want to check out more software, such as Faxtastic or CopyPod, which might be related to MessagingToolkit.