Electronic Signatures

For full contract lifecycle (drafting, redlining, renewals) see Contract Management. For PDF generation / templating see PDF & Documents.

Open source / self-host

★ Documenso — modern, TypeScript / Next.js; AGPLv3 self-host plus hosted free + paid tiers. The default OSS pick in 2026 if you want DocuSign-shape e-sign you can self-host.
★ DocuSeal — competitor; AGPLv3 (or paid commercial license); cleaner template builder; hosted free tier. Strong alternative to Documenso.
OpenSign — open source; AGPLv3; hosted free tier; PDF-template-driven workflows.
SignServer — Java; long-running; for high-volume / regulated PKI signing rather than human-facing e-sign workflows.
PrivacyIDEA + EJBCA — for certificate-based signing infrastructure (eIDAS qualified signatures), not consumer-style e-sign.

★ Documenso Cloud — generous free tier; most teams stay on it.
★ DocuSeal Cloud — generous free tier.
SignWell (formerly Docsketch) — free tier (3 docs / month); polished UX.
Dropbox Sign (formerly HelloSign) — small free tier (3 docs / month per user); paid above.
Signaturely — small free tier.
eSignatures.io — pay-per-use ($0.49 / contract); no monthly fee.
jSign — free tier.

★ DocuSign — incumbent; expensive; what enterprise procurement expects.
★ Adobe Acrobat Sign — bundled with many Adobe accounts; enterprise-friendly.
PandaDoc — combines proposals + e-sign + payments; paid.
Concord — contract management with e-sign built in; see Contract Management.
Proposify — proposal-flavored.

DocuSign eIDAS, Adobe Acrobat Sign eIDAS — both support QES with trust-service-provider integration.
Namirial, Buypass, Yousign (FR), Signicat — European TSPs; required for legally-binding QES in regulated EU contexts.
EJBCA + your own TSA — fully self-hosted QES is feasible but expensive in compliance overhead; only worth it if you're a TSP yourself.

Real-estate / mortgage: dotloop, DocMagic — paid; deeply integrated with MLS / loan systems.
HR onboarding: most HRIS (Gusto / Rippling / BambooHR) include built-in e-sign for offer letters / I-9 / W-4.
Notarization: Notarize, Proof.com — remote online notarization; paid.

Documenso, DocuSeal, OpenSign — all AGPLv3. Self-host fine; if you're embedding e-sign as a feature in a commercial SaaS, get a commercial license or use the hosted product.

Default OSS, modern stack: Documenso (or DocuSeal — flip a coin).
Cheapest pay-per-use, no subscription: eSignatures.io.
Enterprise procurement asked specifically: DocuSign or Adobe Sign.
You need eIDAS QES: Yousign / Namirial / Signicat through DocuSign or Adobe.
You only need a few signatures / month, free: SignWell free or Documenso Cloud free.