Modern Java 21 SMPP 3.4 library for high-performance SMS messaging. Features virtual threads, Netty transport, immutable PDUs, and auto-reconnect.
Cost / License
- Free
- Open Source (Apache-2.0)
Platforms
- Mac
- Windows
- Linux
- Java

Modern Java 21 SMPP 3.4 library for high-performance SMS messaging. Features virtual threads, Netty transport, immutable PDUs, and auto-reconnect.

Streamline global communication with this cloud-based phone solution, offering VoIP setup, integrations, international numbers, and advanced collaborative features.




KrispCall is an AI-powered phone app for modern businesses, integrating with your CRM to streamline global operations & drive growth.




Ploito – a virtual office for remote work. An application for organizing remote work with video walkie-talkie, telepresence effect, burnout prevention and employees health tracker.




VoIP.ms is a Voice over IP (VoIP) Software as a Service (SaaS). Which offers a vast range of residential or business telephony & communication features.




LegitSMS.com provides reliable, non-VoIP virtual phone numbers for instant SMS verification on any online platform (WhatsApp, Facebook, Amazon, etc.), ensuring privacy and consistent code delivery.


Connect, integrate and automate all of your systems, APIs and apps, including cloud and legacy ones, using an open-source integration platform in Python.




Virtual phone system for businesses with inbound and outbound calls, CRM integrations, virtual phone numbers, SMS and more.




Sideline is the work number for your smartphone. It uses your existing carrier network so that 2nd number works wherever you do. Porting numbers from another service is available.




The mission of Bridgepoint Education is to provide high quality, innovative education services to enrich the lives and communities the company serves.
Outboundify is lean B2B sales prospecting for startups. For one flat hourly rate, our clients can reserve a friendly, English-speaking call center rep who comes fully equipped with a cloud-based predictive dialer and a list of prospects to call.

Upcall is the 1st collaborative call outsourcing platform, allowing businesses from around the world to create smart outbound call campaigns in less than 5 minutes.




“AI-powered phone system with built-in contact center, predictive dialers & global numbers – loved by retail & e-commerce teams.”




Phonecall lets you call international phone numbers directly from your browser—no SIM, no roaming, no separate app install.

Spoof Caller ID is a premium telecom platform that provides fast, reliable spoof calling with advanced privacy protection and global coverage. Built for professionals, businesses, and privacy-focused users, the service delivers high-quality voice routing, real-time call...

RingOver: the 100% cloud-based business phone system for flexible teams to simplify call handling. Obtain virtual numbers in 60+ countries and benefit from free unlimited calls. Sales and support teams can improve their CRM and Helpdesk tools by integrating with RingOver to...




MeetFox helps you maximize your most valuable asset - time. It is an end-to-end meeting platform that combines appointments scheduling, in-browser video calls, and secure client payments with invoicing.




VoxSun is the alternative operator specializing in hosted phone systems in the cloud. VoxSun is a member of the FCC and CRTC and offers telephone systems and lines for businesses, mobile professionals and individuals.
PBXware is the world’s first and most mature IP PBX Professional Open Standards Turnkey Telephony Platform. Bicom Systems’ softswitch is offered in the Business, Call Center and Multi-Tenant Editions.




Bitcall OS lets anyone launch and run a white-label telecom business—selling eSIM, WebRTC/VoIP, SMS, OTP, and HLR, from one prepaid, crypto-friendly dashboard.



Started as a reimplementation of the open source Plivo Framework (unmaintained as of 2015), Eqivo simplifies the integration between web applications and voice-enabled endpoints, such as traditional phone lines (PSTN), VoIP phones, webRTC clients etc.

Receive & send SMS messages, allocate phone numbers, control incoming phone calls, build IVRs, connect calls and create automated outgoing phone calls. Simply Voice, SMS & MMS in one easy API.
The Ohayu eSIM simplifies travel by ensuring seamless connectivity abroad. It provides a reliable internet connection in nearly every country worldwide.



