SharePoint 2010 & 2013 Language Pack Downloader is a tool to quickly download multiple language pack files for the SharePoint 2010 and 2013 Server and Foundation platform.
This project is detailed further on my blog here:
Update November 7 2013:
The project was updated to download SharePoint Foundation 2013 language packs.
Update September 13 2013:
The project was updated to download 2010 SP2 language packs.
Update June 6 2013: The project was updated to download 2013 language packs.
Update August 16 2012: The project was updated to fix a crash caused by updated URL at Microsoft
Update July 21: The project was updated to select or deselect all languages (http://wp.me/p1z8Wv-4m)
Update June 30: The project was updated to handle SharePoint Foundation 2010 (http://wp.me/p1z8Wv-3B)
Update June 28: This project simplifies the download of Service Pack 1 of the SharePoint 2010 Language Packs. (http://wp.me/p1z8Wv-3w)
Update June 20: This project was updated to grab the download urls directly from the Microsoft Download Center. (http://wp.me/p1z8Wv-2I)
The idea for this project was based on Ryan Dennis' blog post