Spark Alternatives
Spark is described as 'Open Source, cross-platform IM client optimized for businesses and organizations. It features built-in support for group chat, telephony integration, and strong security' and is a Instant Messenger in the Social & Communications category. There are more than 25 alternatives to Spark for a variety of platforms, including Windows, Mac, Linux, BSD and Android. The best alternative is Jitsi, which is both free and Open Source. Other great apps like Spark are Pidgin (Free, Open Source), Trillian (Freemium), Adium (Free, Open Source) and Gajim (Free, Open Source).
- Jitsi (previously SIP Communicator) is an audio/video and chat communicator with full encryption that supports protocols such as SIP, XMPP/Jabber, ICQ/AIM, Windows Live, Yahoo!, GTalk/Hangouts extensions, as well as OTR, ZRTP, etc.
- Free • Open Source
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Android Tablet
- BSD
- iPad
- Pidgin is an easy to use, multi-protocol chat client client used by millions. Connect to AIM, MSN, Yahoo, XMPP, and more chat networks all at once. It has built-in support for NSS, offering client-to-server message encryption for protocols that support it.
- Free • Open Source
- Mac
- Windows
- Linux
- BSD
- PortableApps.com
- Xfce
- Trillian is an instant messaging app that works on phones, tablets, and desktops while keeping your chats neatly synchronized between all of them! We think conversation should be easily shared between all of your devices, not trapped as text messages on your phone.
- Freemium • Proprietary
- Mac
- Windows
- Linux
- Online
- Android
- iPhone
- Blackberry
- iPad
- Adium is a free and open source instant messaging application for Mac OS X, written using Mac OS Xs Cocoa API, released under the GNU GPL and developed by the Adium team.
- The goal of Gajim is to provide a full featured and easy to use XMPP client. Gajim works nicely with GNOME, but does not require it to run. It is released under the GNU General Public License.
- Empathy is a messaging program which supports text, voice, video chat, and file transfers over many different protocols. You can tell it about your accounts on all those services and do all your chatting within one application.
Discontinued
Empathy is currently unmaintained. Last version, 3.25, released in August 2017, can be still downloaded from the official website.
- Chat everywhere! IM+ is the most widely used mobile IM app! Connect all-in-one to MSN, Yahoo!, Google Talk, AIM, Jabber, ICQ, Facebook, MySpace and Twitter on ALL popular mobile platforms.
- Freemium • Proprietary
- Online
- Windows Mobile
- Android
- iPhone
- Java Mobile
- Symbian S60
- HP webOS
- Blackberry
- Android Tablet
- Windows Phone
- iPad
- Kindle Fire
- What does it do: * Send/receive chat messages * Create/change conversations (rename, add people) * Leave/delete conversation * Notifications * Toggle notifications on/off * Drag-drop, copy-paste or attach-button for image upload.
- An instant messaging application for Windows, Linux, and Mac OS X that connects to the free, open XMPP network.
- Messenger for Desktop is a wrapper for the official client messenger.com. Therefore it works like a regular browser which can only navigate to the messenger.com web app. MFD doesn't touch your messages, account or personal data. All that is handled securely by Facebook.
Bundleware
Be careful during the installation: Forum