Thirdlane Business PBX is described as 'platform provides all of the easy-to-use advanced communications features businesses need, with the flexibility for customization and growth - at a fraction of the cost of competitive solutions' and is an app in the Social & Communications category. There are seven alternatives to Thirdlane Business PBX for a variety of platforms, including Linux, Mac, Windows, Android and iPhone. The best alternative is Asterisk, which is both free and Open Source. Other great apps like Thirdlane Business PBX are 3CX Phone System (Freemium), FreePBX (Free, Open Source), RingCentral (Paid) and PBXware (Paid).
FreePBX is a web-based open source GUI (graphical user interface) that controls and manages Asterisk (PBX), an open source communication server. FreePBX is licensed under the GNU General Public License (GPL), an open source license.