Choosing workflow automation tools is messy because the category includes visual automation builders, data-pipeline orchestrators, background-job systems, browser automation, security automation, and business-process engines.
The ranking uses ToolVitals score first and GitHub stars as a secondary popularity signal. That puts the 100-score group at the top, with n8n ahead on stars while still clearly labeled Fair-code, not OSI-approved, followed by OSI-approved OSS tools such as Kestra, Activepieces, and Prefect.
Rankings
| Rank | Tool | Openness | License | Health | Shipping | GitHub Stars | Score | Status |
|---|---|---|---|---|---|---|---|---|
| 1 | n8n | Fair-code, not OSI-approved | NOASSERTION | 100 | 100 | 195127 | 100 | 🟢 Excellent |
| 2 | Kestra | OSI-approved OSS | Apache-2.0 | 100 | 100 | 27238 | 100 | 🟢 Excellent |
| 3 | Activepieces | OSI-approved OSS | MIT | 100 | 100 | 23109 | 100 | 🟢 Excellent |
| 4 | Prefect | OSI-approved OSS | Apache-2.0 | 100 | 100 | 22753 | 100 | 🟢 Excellent |
| 5 | Trigger.dev | OSI-approved OSS | Apache-2.0 | 98 | 98 | 15559 | 99 | 🟢 Excellent |
| 6 | Hatchet | OSI-approved OSS | MIT | 98 | 100 | 7456 | 99 | 🟢 Excellent |
| 7 | Sim | OSI-approved OSS | Apache-2.0 | 94 | 98 | 28942 | 97 | 🟢 Excellent |
| 8 | Skyvern | OSI-approved OSS | AGPL-3.0 | 94 | 98 | 22108 | 97 | 🟢 Excellent |
| 9 | Flyte | OSI-approved OSS | Apache-2.0 | 93 | 100 | 7128 | 97 | 🟢 Excellent |
| 10 | Dagu | OSI-approved OSS | GPL-3.0 | 95 | 98 | 3601 | 97 | 🟢 Excellent |
| 11 | Conductor | OSI-approved OSS | Apache-2.0 | 95 | 100 | 31993 | 96 | 🟢 Excellent |
| 12 | Unstract | OSI-approved OSS | AGPL-3.0 | 96 | 93 | 6687 | 96 | 🟢 Excellent |
| 13 | Tracecat | OSI-approved OSS | AGPL-3.0 | 92 | 98 | 3708 | 96 | 🟢 Excellent |
| 14 | Temporal | OSI-approved OSS | MIT | 93 | 95 | 21409 | 95 | 🟢 Excellent |
| 15 | gh-aw | OSI-approved OSS | MIT | 92 | 95 | 4718 | 95 | 🟢 Excellent |
| 16 | Node-RED | OSI-approved OSS | Apache-2.0 | 91 | 93 | 23379 | 94 | 🟢 Excellent |
| 17 | PipesHub AI | OSI-approved OSS | Apache-2.0 | 88 | 95 | 3010 | 93 | 🟢 Excellent |
| 18 | Kaoto | OSI-approved OSS | Apache-2.0 | 86 | 95 | 109 | 93 | 🟢 Excellent |
| 19 | nodetool | OSI-approved OSS | AGPL-3.0 | 85 | 95 | 420 | 92 | 🟢 Excellent |
| 20 | Fastlane | OSI-approved OSS | MIT | 93 | 84 | 41738 | 91 | 🟢 Excellent |
| 21 | LibreSign | OSI-approved OSS | AGPL-3.0 | 85 | 95 | 777 | 90 | 🟢 Excellent |
| 22 | ByteChef | OSI-approved OSS | Apache-2.0 | 83 | 87 | 897 | 89 | 🟢 Excellent |
| 23 | MaaPipelineEditor | OSI-approved OSS | MIT | 81 | 95 | 335 | 89 | 🟢 Excellent |
| 24 | Pneumatic | OSI-approved OSS | Apache-2.0 | 82 | 90 | 307 | 89 | 🟢 Excellent |
| 25 | Runtara | OSI-approved OSS | AGPL-3.0 | 79 | 95 | 18 | 89 | 🟢 Excellent |
| 26 | Bifrost Integrations | OSI-approved OSS | AGPL-3.0 | 80 | 90 | 47 | 88 | 🟢 Excellent |
| 27 | DBOS Transact Golang | OSI-approved OSS | MIT | 87 | 75 | 749 | 87 | 🟢 Excellent |
| 28 | epistola-suite | OSI-approved OSS | AGPL-3.0 | 79 | 95 | 3 | 87 | 🟢 Excellent |
| 29 | FlowCtl | OSI-approved OSS | Apache-2.0 | 77 | 84 | 322 | 84 | 🟢 Excellent |
| 30 | OpenWorkflow | OSI-approved OSS | Apache-2.0 | 78 | 69 | 1266 | 81 | 🟢 Excellent |
| 31 | diun | OSI-approved OSS | MIT | 71 | 63 | 0 | 74 | 🟢 Good |
| 32 | Huginn | OSI-approved OSS | MIT | 76 | 54 | 49569 | 73 | 🟢 Good |
| 33 | Ryax | OSI-approved OSS | MPL-2.0 | 70 | 48 | 187 | 71 | 🟢 Good |
| 34 | Loopi | OSI-approved OSS | MIT | 66 | 55 | 185 | 71 | 🟢 Good |
| 35 | gflow | OSI-approved OSS | MIT | 70 | 54 | 79 | 71 | 🟢 Good |
| 36 | SymFlowBuilder | OSI-approved OSS | MIT | 60 | 61 | 28 | 70 | 🟢 Good |
| 37 | OpenCowork | OSI-approved OSS | Apache-2.0 | 70 | 53 | 0 | 70 | 🟢 Good |
| 38 | Rulego | OSI-approved OSS | Apache-2.0 | 70 | 51 | 1555 | 69 | 🟢 Good |
| 39 | maestro | OSI-approved OSS | Apache-2.0 | 74 | 48 | 3798 | 68 | 🟢 Good |
| 40 | Flow | OSI-approved OSS | Apache-2.0 | 71 | 40 | 136 | 67 | 🟢 Good |
| 41 | Velda | OSI-approved OSS | Apache-2.0 | 67 | 41 | 82 | 67 | 🟢 Good |
| 42 | Ordo | OSI-approved OSS | MIT | 71 | 37 | 29 | 67 | 🟢 Good |
| 43 | FlowGram | OSI-approved OSS | MIT | 65 | 40 | 8179 | 66 | 🟢 Good |
| 44 | Flux Workflow | OSI-approved OSS | MIT | 53 | 60 | 1 | 65 | 🟢 Good |
| 45 | Viewflow | OSI-approved OSS | AGPL-3.0 | 72 | 28 | 2868 | 64 | 🟢 Good |
| 46 | Lamda | OSI-approved OSS | MIT | 70 | 22 | 7856 | 62 | 🟢 Good |
| 47 | Flowable Engine | OSI-approved OSS | Apache-2.0 | 66 | 27 | 9355 | 61 | 🟢 Good |
| 48 | Flowwink | OSI-approved OSS | MIT | 44 | 60 | 12 | 60 | 🟢 Good |
| 49 | Adjutant | OSI-approved OSS | AGPL-3.0 | 44 | 39 | 0 | 55 | 🟡 Fair |
| 50 | Integuru | OSI-approved OSS | AGPL-3.0 | 62 | 14 | 4630 | 54 | 🟡 Fair |
Top 3 Highlights
n8n ranks first with a ToolVitals score of 100, health score of 100, shipping score of 100, and 195127 GitHub stars. Its description points to a broad workflow automation platform with native AI capabilities, visual building, custom code, self-hosting or cloud options, and 400+ integrations. Its openness_label is Fair-code, not OSI-approved and its license_label is NOASSERTION, so it should be treated as source-visible rather than OSI open source.
Kestra ranks second with a ToolVitals score of 100, health score of 100, shipping score of 100, and 27238 GitHub stars. It is described as an event-driven orchestration and scheduling platform for mission-critical applications. Its openness_label is OSI-approved OSS and its license_label is Apache-2.0.
Activepieces ranks third with a ToolVitals score of 100, health score of 100, shipping score of 100, and 23109 GitHub stars. The supplied description emphasizes AI workflow automation, AI agents, and MCP support. Its openness_label is OSI-approved OSS and its license_label is MIT.
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