Official app for OS X from Telegram team
This software is available under GPL v3 license.
Source code is available on GitHub.

Version history

v 0.9.21 dev 09.02.16

  • Bug fixes and other minor improvements

v 0.9.20 dev 08.02.16

  • Testing new crash reporting system
  • Conversation history is centered in wide windows
  • New cute link and timestamp tooltips design
  • Ctrl+W or Ctrl+F4 closes Telegram window
  • Bug fixes and other minor improvements

v 0.9.19 dev 09.01.16

  • Choose an emoticon and see the suggested stickers
  • Bug fixes and minor improvements

v 0.9.18 stable 05.01.16

  • Bug fixes and minor improvements

v 0.9.17 stable 04.01.16

  • Crash fixed

v 0.9.16 stable 04.01.16

  • GIFs autoplay and automatic download
  • Inline bots support
  • Automatic download settings added
  • All media redesigned

v 0.9.15 stable 09.12.15

  • Sticker management: manually rearrange your sticker packs, pack order is now synced across all your devices
  • Click and hold on a sticker to preview it before sending
  • New context menu for chats in chats list
  • Support for all existing emoji

v 0.9.14 dev 09.12.15

  • Sticker management: manually rearrange your sticker packs, pack order is now synced across all your devices
  • Click and hold on a sticker to preview it before sending
  • New context menu for chats in chats list
  • Support for all existing emoji

v 0.9.13 stable 25.11.15

  • Groups can now have multiple administrators with the ability to edit the name and logo, and add and remove members
  • Groups that have reached their capacity of 200 users can be upgraded to supergroups of up to 1,000 members

v 0.9.12 dev 22.11.15

  • Bug fixes and other minor improvements

v 0.9.11 dev 22.11.15

  • Groups can now have multiple administrators with the ability to edit the name and logo, and add and remove members
  • Groups that have reached their capacity of 200 users can be upgraded to supergroups of up to 1,000 members

v 0.9.10 stable 04.11.15

  • New shared audio files section
  • New design for popup menus
  • Add captions to any photos you send
  • Surround text with `single backticks` for inline monowidth code and ```triple backticks``` for blocks of code
  • The Tilde symbol is now displayed correctly

v 0.9.9 dev 02.11.15

  • New popup menus in text input fields
  • Error is displayed when trying to paste or drop a folder instead of a file
  • Some bugfixes and improvements

v 0.9.8 dev 28.10.15

  • Tilde symbol fixed in message input field
  • Add a caption to any photo you send
  • Bad sound quality bug fixed
  • Some bugfixes and improvements

v 0.9.7 dev 23.10.15

  • Tilde symbol display fixed
  • Bold and Italic text display from bots supported
  • Send code without text and emoji replaces using `such syntax` for inline parts and ```such syntax``` for blocks of code
  • Some bugfixes and improvements

v 0.9.6 stable 14.10.15

  • Bug fixes and other minor improvements

v 0.9.5 stable 14.10.15

  • Improved speed
  • First steps towards a new design

v 0.9.4 dev 12.10.15

  • New design for all modal windows
  • Toggle notifications from tray menu
  • Bug fixes and other minor improvements

v 0.9.3 dev 01.10.15

  • Dialogs and emoji render made much faster
  • Bug fixes and other minor improvements

v 0.9.2 stable 25.09.15

  • Bug fixes and other minor improvements

v 0.9.1 stable 24.09.15

  • Bug fixes and other minor improvements

v 0.9 stable 24.09.15

  • Introducing Channels — a great new way to broadcast your messages to unlimited audiences
  • Other fixes and improvements

Dev version

If you would like to get all updates faster and be the first to test new features, you are welcome to use Telegram Desktop's dev version instead of the public one.

The public version is updated less frequently, but is more stable than the dev version.

Here are the dev version links for different platforms:

Windows Setup
Windows Portable
Mac OS X 10.8+ Setup
Mac OS X 10.6 and 10.7 Setup
Linux 64 bit
Linux 32 bit

Just install it on top of your current Telegram Desktop and there you go.
Your feedback is welcome on Twitter