Photo credit: Alejandro Mendoza R

1. BitWise IM: Free instant messaging software allows you to communicate online
2. BigFilez: Send big files up to 500MB to anyone with an email address
3. CSpace: Chat, transfer files and remote desktop with a simple interface
4. HFS: Turn your computer into a server and share any file online

1. BitWise IM
   
   BitWise IM is a free instant messaging software for Windows, Mac and Linux that anyone can use to communicate online. It allows you send text-messages, share files with no size limit, offering the possibility to pause and resume sharing, whiteboard with one or more people, have audio-conferences, save the conversation history and more. BitWise IM is completely free to download and use.
   http://www.bitwiseim.com/





2. BigFilez
   
   BigFilez is a free web service that you can use to send any file up to 500 MB to anyone. There are several uploading methods that you can choose: you can normally browse for files using the normal "Form Upload", select files clicking the plus sign and get previewed in real time how big they are with the "Flash Upload", or just provide the file's URL with the "URL Upload". Then you just have to type the recipients' email, and click upload. Free, no registration needed.
   http://bigfilez.com/





3. CSpace
   
   CSpace is a free open-source downloadable software for Windows and Linux that you can use to chat, transfer files and remote desktop. From its clean and simple interface, you can browse your contacts through a contact list and, when you right click a name, you can choose whether to start a chat with that person, send files in P2P mode using Drag&Drop, and also remote desktop. It is free to download and use.
   http://www.cspace.in/





4. HFS
   
   HFS (HTTP File Server) is a freeware application that makes it simple to run a server to share files from your computer over the web. All you have to do is run the application on the computer with files you want to share and pick the files or directories that you want to allow access to. In addition, you can even upload files to your HFS server from elsewhere, just by typing your computer's IP address. Windows only.
   http://rejetto.com/hfs/