Secure instant messaging system for team collaboration
For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
LAN Messenger - LAN Messenger is a decentralized UDP IM-style chat client which supports usernames...
Dropbox - Online Sync and File Sharing
Softros LAN messenger - LAN messenger for an internal office chat for home or business users. It does not require a server and is very easy to install and use. It supports personal chats, group chats, message brodcasting, files transfer and remote desktop access.
Google Drive - Access and sync your files anywhere
Bopup IM Suite - Organize secure messaging system and communicate instantly via self-hosted IM server.
Mega - Secure File Storage and collaboration