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#2 Asterisk
The original open‑source telephony engine that powers many PBX solutions; highly modular with a massive ecosystem of add‑ons.
#3 FreeSWITCH
Scalable, multi‑protocol softswitch designed for voice, video, and chat; often used as the core for other PBX projects.
#4 FusionPBX
Web‑based GUI for FreeSWITCH offering multi‑tenant PBX features, call routing, and voicemail.
#5 Issabel
Community‑driven fork of Elastix; integrates Asterisk with CRM, call‑center, and reporting tools.
#6 Wazo
Open‑source unified communications platform built on Asterisk, providing web UI, APIs, and multi‑tenant support.
#7 Kamailio
High‑performance SIP server ideal for large‑scale deployments, load balancing, and routing.
#8 OpenSIPS
Feature‑rich SIP proxy/server offering advanced routing, NAT traversal, and carrier‑grade reliability.
Windows‑based PBX with a free tier for up to 8 simultaneous calls; includes web conferencing and mobile apps.
#10 Elastix
Legacy all‑in‑one communications suite (PBX, email, fax, IM) built on Asterisk; still used in many legacy environments.
#11 ViciDial
Open‑source call‑center solution that adds predictive dialing, inbound/outbound routing, and agent management on top of Asterisk.
#12 GoAutoDial
User‑friendly web UI for ViciDial, simplifying installation, monitoring, and reporting for call centers.
Modular telephony engine supporting VoIP, PSTN, and SMS; can be used as a PBX or SIP router.
#14 SipXcom
Enterprise‑grade SIP communications platform offering PBX, voicemail, and video conferencing; now part of the 2600Hz project.
Community‑driven SIP server providing core telephony services, often paired with other PBX front‑ends.
#16 Trixbox
Formerly a popular Asterisk‑based distribution with a web GUI; still maintained by community forks.
Pre‑configured Asterisk distribution with a web interface; offers a quick start for small‑to‑medium deployments.
#18 A2Billing
Open‑source billing and rate‑engine that can turn an Asterisk server into a full‑featured VoIP carrier.
#19 OpenPBX
Lightweight Asterisk‑based PBX with a simple web UI, targeting small businesses and hobbyists.
Free community version of Mitel’s SIP PBX, offering call routing, voicemail, and basic call‑center features.
Open‑source analytics engine for Asterisk and FreePBX; often used alongside other PBX platforms to provide detailed call‑center reporting.