n8n.

Open-source workflow automation tool with fair-code license and self-hosting option

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ARIS (Software AG)
German enterprise BPM suite for process analysis, design and optimization
DE · commercial
↗
Bonitasoft
French open-source BPM and low-code platform for process automation
FR · open-source
↗
Camunda
Open-source process orchestration platform for workflow and decision automation
DE · open-source
↗
Flowable
Swiss open-source BPM, CMMN and DMN platform for process automation
CH · open-source
↗
Imixs-Workflow
German open-source workflow engine based on BPMN 2.0 for Java applications
DE · open-source
↗
Joget
Open-source no-code/low-code platform combining BPM, workflow and app building
DE · open-source
↗
ProcessMaker
Low-code BPM and workflow automation platform for enterprise processes
IE · open-source
↗
Signavio (SAP)
German process management and mining platform, now part of SAP
DE · commercial
↗