Photo credit: Fambros

1. xyWrite.it: Create text documents online, invite your friends to edit them and export the final file
2. Yakkle: Free downloadable instant messenger for Windows lets you have VoIP calls and share your screen
3. SendAlong: Send any file up to 100MB to multiple email addresses
4. Talck: Create a chatroom and invite people with a sharing-URL

1. xyWrite.it
   
   xyWrite.it is an online collaborative writing tool that anyone can use to create text documents online and share them with anyone. Without signing up to any service, you just have to type a title, email and a share-password to create your document. You can then share a link in order to allow people to edit the document, which will be password-protected, or export your file in PDF, RTF or HTML. Free to use.
   http://xywrite.it/





2. Yakkle
   
   Yakkle is a downloadable application for Windows that lets you chat, share files, have VoIP conferences, and more. After a small download (less than 1MB), you can start using Yakkle in all of its features: instant messaging, VoIP, screen sharing, remote control and file sharing are the main features, as well as, group chats, contact list and Gmail notifications. Free to download and use.
   http://www.yakkle.com/





3. SendAlong
   
   SendAlong is a new online service that allows you to send files up to 100Mb to your friends. You just have to sign up for an account, login, put in your email address together with recipient's address, add a message, attach your files (supports multiple attachments) and click send. Recipients will receive an email containing the download link to get their file. The free version lets you send files up to 100MB but you can also check the other paid versions.
   https://www.sendalong.com/





4. Talck
   
   Talck is a web-based Spanish service that you can use to create chatrooms online. Even if the interface is in Spanish, there's not much to understand in order to create your room. Just go to the site, type in the room's name, which will also be the first part of the URL, and click enter. Your room will be created immediately, and you can start chatting by sharing the URL name.talck.com. Free to use.
   http://www.talck.net/