Mautic
Leading#1 in Open sourcehigh confidence
The recognized open-source marketing-automation platform (~10.2k stars); its campaign/drip builder drives multi-step email sequences. Built for nurture more than pure cold prospecting, so it is adapted for outreach rather than cold-native.Our read
Why it ranks #1
A recognized open-source marketing-automation platform with roughly 10k GitHub stars and a long-standing enterprise/community ecosystem, though its reputation is for nurture automation rather than cold outreach.Here is the catch
heavy to install, upgrade and operate
designed for consent-based nurture, not mailbox-based cold sending
deliverability infrastructure and compliance remain the operator's responsibility
Does this well
mature, extensible marketing-automation platform
full data ownership and deep campaign logic
large integration and implementation ecosystem
Pricing
Checked by hand on 2026-07-23. Prices in this category change often — if this looks wrong, it probably is.
Key features
visual campaign automationemail builder and segmentationlead scoring and formsCRM and channel integrations
Sources we read
Quick facts
More in this area
The rest of the Open source column.- 2OpenOutreachA purpose-built self-hosted AI cold-outreach agent (~2.5k stars) that finds ICP leads, resolves work emails and sends personalized outreach from your own mailbox. The closest OSS fit for an end-to-end cold pipeline, but younger and smaller than the platforms above.
- 3listmonkThe highest-star self-hosted bulk email / campaign sender (~22.4k stars). Newsletter and opt-in oriented rather than cold-native, so it is a strong sending backend but not a sequencing or copywriting tool — hence medium for cold outreach.
- 4BillionMailA self-hosted mail server plus marketing/newsletter stack (~15.4k stars) for sending on your own domain and IP at scale. Sending infrastructure and deliverability, not cold sequencing or copy.
- 5artbyjazi/cold-outreach-builderA skill file that has an AI assistant interview you, then generate your own local Python and Streamlit sending tool.
- 6dancolta/trustpilot-outreach-automationScrapes one- and two-star Trustpilot reviews of competitors and drafts emails quoting them in Gmail, leaving every send for you.
- 7Webeasetech/densheesSelf-hosted outreach platform that sends from your own inboxes and drives campaigns, leads and CRM through typed natural-language commands rather than menus.