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The Open Source Alternative for Every SaaS Category

·OSSAlt Team
open-sourcealternativesdirectorysaas2026
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The Open Source Alternative for Every SaaS Category

Whatever SaaS tool you're using, there's probably an open source alternative. Here's the definitive list — 50+ categories, 100+ tools.

Communication

SaaSOSS AlternativeStarsLicense
SlackMattermost30K+AGPL-3.0
SlackRocket.Chat40K+MIT
Microsoft TeamsElement (Matrix)11K+Apache-2.0
DiscordRevolt900+AGPL-3.0
ZoomJitsi Meet23K+Apache-2.0
Google MeetBigBlueButton8K+LGPL
LoomOBS Studio60K+GPL-2.0

Project Management

SaaSOSS AlternativeStarsLicense
JiraPlane30K+AGPL-3.0
LinearPlane30K+AGPL-3.0
AsanaTaiga7K+MPL-2.0
Monday.comOpenProject9K+GPL-3.0
TrelloWeKan19K+MIT
TrelloPlanka5K+AGPL-3.0

Documentation & Knowledge

SaaSOSS AlternativeStarsLicense
NotionOutline28K+BSL
NotionAppFlowy56K+AGPL-3.0
ConfluenceBookStack15K+MIT
ConfluenceWiki.js25K+AGPL-3.0
Google DocsNextcloud Office27K+AGPL-3.0
ObsidianLogseq32K+AGPL-3.0

Analytics & BI

SaaSOSS AlternativeStarsLicense
Google AnalyticsPlausible20K+AGPL-3.0
Google AnalyticsUmami22K+MIT
MixpanelPostHog20K+MIT
MatomoMatomo20K+GPL-3.0
TableauMetabase39K+AGPL-3.0
TableauApache Superset63K+Apache-2.0
Power BIRedash26K+BSD-2
AmplitudePostHog20K+MIT

CRM & Sales

SaaSOSS AlternativeStarsLicense
SalesforceTwenty20K+AGPL-3.0
HubSpotErxes3.5K+AGPL-3.0
PipedriveEspoCRM1.7K+AGPL-3.0

Customer Support

SaaSOSS AlternativeStarsLicense
IntercomChatwoot21K+MIT
ZendeskZammad4K+AGPL-3.0
FreshdeskFreeScout2.8K+AGPL-3.0

Email Marketing

SaaSOSS AlternativeStarsLicense
MailchimpListmonk15K+AGPL-3.0
MailchimpMautic7K+GPL-3.0

Design & Creative

SaaSOSS AlternativeStarsLicense
FigmaPenpot33K+MPL-2.0
Adobe IllustratorInkscape2K+GPL-2.0
Adobe PhotoshopGIMP—GPL-3.0
CanvaExcalidraw84K+MIT
Adobe LightroomDarktable9K+GPL-3.0
BlenderBlender13K+GPL-3.0

Scheduling

SaaSOSS AlternativeStarsLicense
CalendlyCal.com35K+AGPL-3.0
DoodleRallly3K+AGPL-3.0

Automation

SaaSOSS AlternativeStarsLicense
Zapiern8n48K+Sustainable Use
Make (Integromat)Automatisch3K+AGPL-3.0

Developer Tools

SaaSOSS AlternativeStarsLicense
PostmanHoppscotch66K+MIT
PostmanBruno27K+MIT
GitHub CopilotContinue20K+Apache-2.0
GitHub CopilotTabby22K+Apache-2.0
VercelCoolify35K+Apache-2.0
HerokuDokku29K+MIT

Backend & Infrastructure

SaaSOSS AlternativeStarsLicense
FirebaseSupabase73K+Apache-2.0
FirebaseAppwrite45K+BSD-3
FirebasePocketBase40K+MIT
AlgoliaMeilisearch47K+MIT
AlgoliaTypesense21K+GPL-3.0
Auth0Keycloak23K+Apache-2.0
Auth0Authentik13K+Custom
Auth0Logto9K+MPL-2.0

E-Commerce

SaaSOSS AlternativeStarsLicense
ShopifyMedusa26K+MIT
ShopifySaleor21K+BSD-3
WooCommerceWooCommerce9K+GPL-3.0

Monitoring & Observability

SaaSOSS AlternativeStarsLicense
DatadogGrafana65K+AGPL-3.0
DatadogPrometheus55K+Apache-2.0
PingdomUptime Kuma58K+MIT
SentryGlitchTip1K+MIT
SentryHighlight.io8K+Apache-2.0
PagerDutyAlertmanager6K+Apache-2.0

Security & Passwords

SaaSOSS AlternativeStarsLicense
1PasswordVaultwarden39K+GPL-3.0
1PasswordKeePassXC20K+GPL-2.0
LastPassBitwarden16K+AGPL-3.0
HashiCorp VaultOpenBao3K+MPL-2.0

Cloud Storage

SaaSOSS AlternativeStarsLicense
DropboxNextcloud27K+AGPL-3.0
Google DriveNextcloud27K+AGPL-3.0

Forms & Surveys

SaaSOSS AlternativeStarsLicense
TypeformFormbricks8K+AGPL-3.0
Google FormsHeyform6K+AGPL-3.0
SurveyMonkeyLimeSurvey2.5K+GPL-2.0
SaaSOSS AlternativeStarsLicense
BitlyDub19K+AGPL-3.0
BitlyShlink3K+MIT

Document Signing

SaaSOSS AlternativeStarsLicense
DocuSignDocumenso6K+AGPL-3.0

Billing & Invoicing

SaaSOSS AlternativeStarsLicense
Stripe BillingKill Bill4.5K+Apache-2.0
FreshBooksInvoice Ninja8K+Elastic License
QuickBooksCrater7.7K+AGPL-3.0

Community & Forum

SaaSOSS AlternativeStarsLicense
CircleDiscourse42K+GPL-2.0
CircleFlarum15K+MIT

The Bottom Line

In 2026, there's an open source alternative for nearly every SaaS category. Some are direct replacements (Plausible for GA, Vaultwarden for 1Password). Others are 80-90% of the way there (Penpot for Figma, Twenty for Salesforce).

The ecosystem has matured to the point where the question isn't "Is there an alternative?" but "Which alternative is best for my use case?"

Compare all open source alternatives side by side at OSSAlt.

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