aTalk

aTalk is an XMPP client that supports the following features: Plain text instant messaging and end-to-end encryption using OMEMO or OTR; SSL certificate authentication, DNSSEC, and DANE security implementations for enhanced secure connection establishment; OMEMO encryption in group chat sessions for enhanced privacy and security; OMEMO media file sharing for all files; Support for HTTP file uploads to share files with offline contacts and in group chats; Support for sharing stickers, Bitmoji, and emoji via Google Gboard to enrich content; Sending and receiving files of all document types and images, with thumbnail previews and GIF animations; Automatic acceptance of file transfer requests with a maximum file size option; Fault-tolerant file transfer algorithms via Jingle File Transfer, Legacy In-Band/SOCKS5 Bytestreams, and HttpFileUpload protocols to simplify and enhance file-sharing reliability; Enhanced and coordinated UI for file sharing in chats and chat rooms; Support for sharing, quoting, and forwarding messages and media, with previews before sending; Support for multi-instance audio media players with features like play, pause, resume, stop, and seek; Support for unread message badges in contact and chat room list views; User-selectable heads-up notifications and quiet time options; Sharing of social media links with thumbnails and title tags; Support for text-to-speech and speech recognition UI, with options enabled for each chat session (contacts and group chats); Call waiting by maintaining ongoing calls to accept a second incoming call, and switching between calls; Implementation of Jabber VoIP-PBX gateway calls, allowing PBX phone calls via service gateways; Multi-user chat for joining or creating rooms, with full room configuration support for owners; Integrated CAPTCHA-protected room UI with retry options on failure; Support for voice and video calls with ZRTP, SDES, and DTLS SRTP encryption modes; ZRTP encryption algorithms using SHA-2 384, 256-bit cipher AES256, and TWOFISH-256, with elliptic curves enabled via Curve 25519; SDES encryption using AES256 and AES192, accelerated with OpenSSL; Support for simultaneous media calls and message chat sessions; Unique GPS location implementation as a standalone tool to send locations to desired contacts for real-time tracking or animated playback; 360° street view of your current location for self-guided tours, tracking and following your line of sight; Integrated photo editor with zoom and crop features for easy avatar updates; Last message correction, message rewriting, and offline messages (OMEMO); Stream management and mobile network ping interval self-adjustment optimization support; In-band registration with CAPTCHA option support; Multiple account creation; User-selectable theme support; Multi-language UI support (Indonesian, English, German, Portuguese, Russian, Slovak, and Spanish); Online help support.

Atalk is an XMPP client designed for Android, offering end-to-end encrypted instant messaging, video calls, and unique GPS features to enhance user communication privacy and security.