Top 5 iPaaS Software SaaS Companies in May 2026

Seattle, Washington, United States

Developer of an enterprise integration platform intended to provide instant and automatic integration between all business applications, databases, directories and devices. The company's cloud-based service provides real-time integration between application platforms and IT infrastructure to achieve accelerated and de-risked financial returns from faster and more complete application platform roll-outs.

Prairie Village, Kansas, United States

SOFTwarfare provides our customers with the KillerAppz product platform for enterprise security integration. KillerAppz is an iPaaS (integration platform-as-a-service) that acts as a platform for middle-ware and integration welding together the cyber security and network operations infrastructure for the customers who use KillerAppz. KillerAppz is a platform for cyber security leaders to standardize on which provides them a suite of cloud services enabling development, execution and governance of integration flows connecting any combination of on premises and cloud-based processes within their cyber security architecture. Theses processes, services and applications and data within individual or across multiple organizations become fully integrated for shared intelligence and acceleration of the business processes in a more automated and efficient manner. SOFTwarfare creates a well thought out equation for pro-active defense and response for your most important platforms to work toge

London, London, United Kingdom

Governments and NGOs worldwide trust OpenFn as their infrastructure backbone to connect Digital Public Goods with other digital services. OpenFn saves organizations time, enhances service delivery, and enables interoperability at scale. Open Function Group is a team of passionate global integration specialists and stewards of the OpenFn DPG. We've delivered solutions to the world's leading social sector organizations in 40+ countries across 4+ continents. OpenFn.org is an integration platform that provides a secure, stable, and scalable (S³) infrastructure for connecting any application and automation critical workflows. Learn more at https://www.openfn.org and https://docs.openfn.org

Montreal, Quebec, Canada

Hookdeck is a fast and reliable event gateway for receiving, processing, and delivering asynchronous messages. It centralizes and streamlines communication between services – external providers (e.g. Shopify), internal endpoints (e.g. APIs), and any combination thereof. Configure Hookdeck platform resources and features such as event routing, filters and transformations. And let Hookdeck automatically retry failed events for painless error recovery. Our developer tooling enables teams to build, deploy, operate, and observe their event-driven applications with confidence.

West Simsbury, Connecticut, United States

Developer of a hybrid cloud integration platform intended to facilitate easy and secure connectivity with minimal to no IT infrastructure investments required. The company's platform provides education know-hows, centralized integration capability, end users tools and collaborative approach, enabling customers to provide them with their integration challenges irrespective of size or complexity.