Giveaway by buttons, by comments, among all subscribers, the contest "subscribe a friend". Checking subscriptions. Statistics and uploading results to Excel.
Karmabot for Telegram - Free bot for tracking performance in chats
Mirro - An all-in-one team performance management solution made easy
HiStaff - Make your staff and workspace happy
Charte - Free online interactive charts for non-techies
iCliniq on Telegram - telegram bot that will get answers from real doctors
Information is Beautiful - Ideas, issues, knowledge, data — visualized!