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Synapse is a corporate messenger for employee communication with support for chats, video/audio calls, and channels, but with notable stability issues, registration problems, and missing basic features (contact blocking, media caching, meeting recording).

Discord is designed for gaming and works great for relaxing with friends or communicating with like-minded people.

МТС Линк is a corporate messenger with video calling and meeting recording capabilities, but suffers from instability when viewing recordings, audio issues, frequent crashes, and a buggy interface.

Asana is a web-based project and task management platform with mobile and desktop applications that enables teams to organize work through tasks and projects in various views (list, kanban, calendar, Gantt chart) and track goals; however, the mobile applications suffer from frequent synchronization errors, registration issues, and incomplete localization.

Talkin is a global multilingual community where voices from different countries and cultures meet in real time.

Official application of the French tax authority for managing tax documents, filing returns, paying bills, and communicating with the administration.

Apple Calendar for viewing and managing events with support for multiple calendar integrations and reminders, but suffers from critical data loss bugs.

Extranet for managing short-term rental listings on Suточno.ru platform: accept and manage bookings, communicate with guests, edit listings and pricing calendar. The app suffers from serious problems with stability, loading speed, and data synchronization reliability.