All versions of Mist requires .NET 4.0 to run. Supported OSes are Windows XP and higher.
A Steam API key is also required. Get one from here.

Changelog
- Minor UI tweaks
- Fixed freezing bug with large friend lists
- Fixes Updater to work properly with v5

{LINK REMOVIDO}Download | Mirror[jzhang.net]
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com

Changelog
- Screenshots are available here[imgur.com]
- Fancy new icon (thanks Protox!)
- Some major UI redesigns (inspired by Metro for Steam[metroforsteam.com]) including toast notifications
- Clicking on toast notifications actually does stuff
- Friend nicknames now show up
- Native trading: all trades are done directly via the Steam website. This means Mist is no longer restricted to TF2 trading
- Augmented trading: while trading Mist will keep track of items for you, such as amount added and price (retrieved from the Steam Community Market)
- Removed backpack.tf integration
- Retrieves chat history from Steam when opening a new chat with a friend, just like the Steam client
- Sentryfiles have been moved to their own folder to keep things tidy. If you are coming from an older version of Mist, move your *.sentryfile files to the folder
- Portable settings fix
- You can now choose to share usage stats when using Mist
- directly send a Trade Offer via right-clicking on a friend
- retrieve a friend's Steam info formatted for SteamRep with the click of a button

{LINK REMOVIDO}Download | Mirror[jzhang.net]
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com

Changelog
- Complete UI redesign. Screenshots can be found here[imgur.com].

{LINK REMOVIDO}Download
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com

Changelog
- Added a "View Profile" option when right-clicking on a friend. This will open their Steam profile in your default browser.
- Implemented filtering/search in the friends' list.
- Implemented an auto-updater. Mist can now update itself without you going to the Steam group.
- Implemented chat logging. This can be turned off if you wish. Feature is on by default.
- Implemented chat log viewer. Just right click on your friend.
- Added automatic SteamRep checking when chatting with people on your friends list. You will be notified of scammers or users with special reputation.
- Added colors to chat. This makes everything much easier to read.
- Added backpack.tf price-checking in the backpack viewer.
- Added backpack.tf price-checking in trade. This feature is turned off by default.
- Added colors to trade chat. Items added to trade will now be displayed with their respective quality colors in trade chat.
- Trade events will be logged in the chat log
- Mist now notifies friends that the user is using the application via a "Now Playing" notification
- Added exit option to Mist
- General bug fixes and tweaks

{LINK REMOVIDO}Download
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com

Changelog
- Fixed the "Add Friend" button from staying in the same place when the form was resized
- Renamed the "Add a Friend"'s title from "AddFriend" to "Add a Friend"
- Added icons to the backpack viewer
- Enabled Mist to run more than one instance from the same folder
- Fixed trade request being sent to the wrong chat tab
- Added a toast notification for trade requests
- Moved Mist's settings file to the application's root folder
- Enabled option to add all items in user's inventory to the trade offerings
- Friend requests are now shown within Mist, and can be added/blocked directly within the application
- Added an option to disable minimizing to tray
- General bug fixes

{LINK REMOVIDO}Download
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com

{LINK REMOVIDO}Download
Virus Scan[www.virustotal.com] courtesy of VirusTotal.com