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iSendr

iSendr is a free online service to share files of any size with your peers using the p2p protocol.
Without resorting to a server to store your data, using iSendr you can directly exchange a file. Just upload your file and share the "secret key" link that iSendr provides you with. On the iSendr homepage your recipients will able to claim the file by inserting the secret key. Your files can also be password-protected if you wish to do so.
http://isendr.com/
1ficher

1ficher is a free online service that you can use to send multiple large files over the web. The total size of the files you send must not exceed 10GB.
You can send up to 500 files simultaneously either via web or using the FTP protocol. Files will be hosted on a domain of your choice that you select using a drop-down-menu and kept for 60 days upon downloading. You can either share the link of your files with your guests or email them right from 1ficher. Your files can also be password-protected.
http://www.1fichier.com/
SendaLargeFile.com

SendaLargeFile.com is a free web-based tool to send files up to 250MB in size over the web.
You only need to provide the email address of your desired recipient and your own email address to get started. Then you can upload a file from your hard-disk and add a message (optional).
http://www.sendalargefile.com/
LargefilesASAP.com

LargefilesASAP.com is a free file-sharing service that allows you to send files over the Internet without sending email attachments.
The service allows you to send a message similar to a standard e-mail, with the only difference that you can attach a file up to 2GB in size. Just type your e-mail address, your receiver's address, select a file on your hard-disk, add a subject and a message (optional) and you're done.
http://www.largefilesasap.com/
Enterupload

Enterupload is a free file-sharing service that allows you to transfer large files over the Internet without resorting to e-mail attachments.
You can upload up to five files of 250MB each and either make your shared files public or private. When files finish uploading, you get a URL that you can share via email or IM so that your buddies can collect the files.
http://www.enterupload.com/
GigaTribe

GigaTribe is a free desktop application for Windows and Mac that allows you to synchronize files and folders over a private distributed network.
You can share all file types of any size and there is no limitation to the number of files and folders you can sync. All data transferred using GigaTribe are encrypted to protect your privacy.
All the computers in the network should have GigaTribe installed for the file sync to work. The service is fully integrated with your desktop environment, so you can move, copy and paste your files and folders normally. Registration is needed to utilize the service.
http://www.gigatribe.com/
Syncplicity

Syncplicity is a desktop application for Windows that allows you to synchronize files up to 2GB over two computers at no charge.
There's no limit to the number of files and folders that you can share and sync over two computers and all file types are OK. All data shared using Syncplicity are encrypted when transferred to protect your privacy and security.
Both computers should have Syncplicty installed for the file transfer to work. The service integrates with Windows desktop environment, so you can move, copy and paste your files and folders just like a normal folder or file inside your computer. Registration is needed to utilize the service.
http://www.syncplicity.com/
Google Docs

Google Docs is a web-based office suite from Google that allows you to upload and share files up to 250MB each with your friends or colleagues (as long as they are using Google Docs as well).
You can either upload a single file or create a folder where to upload multiple files to share with other Google Docs users. Uploaded files have no pre-set expiry date and are thus hosted by Google hosting servers until deletion.
File uploaded to Google Docs are encrypted to preserve the privacy of your data. You need a free Google account to utilize the service.
http://docs.google.com/
Binfer

Binfer is a P2P desktop application for Windows, Mac and Linux that allows you to transfer files of any size over the Internet.
You can upload multiple files at the same time and no expiry time is set for the receiver to download your files. The file transfer process takes place as a direct connection between your computer and the machine of your selected user. Both user should have Binfer installed and be online at the same time for the file transfer to be successful.
File transferred with Binfer are encrypted to save the privacy of your data. Registration is needed to utilize the service. Binfer is free up to 1GB of files sent. Then you will have to purchase one of the available premium plans.
http://www.binfer.com/
Pando

Pando is a P2P file-sharing software for both Mac and Windows that you can use to upload and share files up to 1GB without spending a dime.
Once you download Pando to your computer, you can use the software to share files with your mates using IM, e-mail or simply the web.
To upload files up to 3GB, receive tech-support, get rid of ads and be able to share password-protected files, you can purchase a Pro license for $24.95.
http://www.pando.com/