Open source alternatives

List of open-source alternatives to everyday SaaS products.

Artificial intelligence chatbot/ LLM (ChatGPT alternatives):

Company	Website	GitHub stars
OpenAssistant	open-assistant.io
Leon	getleon.ai
ChatRWKV	twitter.com/BlinkDL_AI

AI code completion (Github CoPilot alternatives):

Company	Website	GitHub stars
FauxPilot	github.com/fauxpilot/fauxpilot/wiki
YouCompleteMe	ycm-core.github.io/ycmd

Team knowledge base (Notion alternatives):

Company	Website	GitHub stars
AppFlowy	appflowy.io
AFFiNE	affine.pro

Internal tools (Retool alternatives):

Company	Website	GitHub stars
Appsmith	appsmith.com
ToolJet	tooljet.com
Budibase	budibase.com
ILLA	illacloud.com
Openblocks	openblocks.dev
Windmill	windmill.dev

Web analytics (Google Analytics alternatives):

Company	Website	GitHub stars
Matomo	matomo.org
Umami	umami.is
Plausible	plausible.io

Note-taking/ Knowledge management (Evernote alternatives):

Company	Website	GitHub stars
Joplin	joplinapp.org
Logseq	logseq.com
SiYuan	b3log.org/siyuan/en
Notesnook	notesnook.com

Company blogs/ newsletters (WordPress alternatives):

Company	Website	GitHub stars
Ghost	ghost.org

Blogging platform/ Personal website builder (Medium alternatives):

Company	Website	GitHub stars
WriteFreely	writefreely.org
btw	btw.so

Static website generator:

Company	Website	GitHub stars
Hugo	gohugo.io
Jekyll	jekyllrb.com
11ty	11ty.dev
Zola	getzola.org

Website builder (Wix, Strikingly, Webflow alternatives):

Company	Website	GitHub stars
Silex	silex.me
DoTenX	dotenx.com

Icons (Noun Project alternatives):

Company	Website	GitHub stars
Font-Awesome	fontawesome.com
feather	feathericons.com
Bootstrap	icons.getbootstrap.com
RemixIcon	remixicon.com

Collaborative design tool (Figma alternatives):

Company	Website	GitHub stars
Penpot	penpot.app
Radix Primitives	radix-ui.com
Plasmic	plasmic.app
Quant-UX	quant-ux.com

Online forms (Typeform alternatives):

Company	Website	GitHub stars
Formbricks	formbricks.com

Session replay and analytics (Fullstory alternatives):

Company	Website	GitHub stars
highlight	highlight.io

Content Management System/ CMS (Contentful alternatives):

Company	Website	GitHub stars
Strapi	strapi.io
Payload	payloadcms.com
Webiny	webiny.com

Log management (Papertrail alternatives):

Company	Website	GitHub stars
Graylog	graylog.org

To-do app:

Company	Website	GitHub stars
super-productivity	super-productivity.com

Community management:

Company	Website	GitHub stars
Discourse	discourse.org
crowd.dev	crowd.dev

Kanban board (Trello alternatives):

Company	Website	GitHub stars
WeKan	wekan.github.io
Focalboard	focalboard.com
Kanboard	kanboard.org
Planka	planka.app

Social network/ Micro-blogging (Twitter alternatives):

Company	Website	GitHub stars
Mastodon	joinmastodon.org
HumHub	humhub.com
Elgg	elgg.org

Ticket management (Zendesk, Freshdesk alternatives):

Company	Website	GitHub stars
Peppermint	peppermint.sh

Scheduling tool (Calendly alternatives):

Company	Website	GitHub stars
Cal.com	cal.com

Smart spreadsheet (Airtable alternatives):

Company	Website	GitHub stars
NocoDB	nocodb.com
Luckysheet	dream-num.github.io/LuckysheetDocs
APITable	apitable.com

Team communication (Slack, Discord alternatives):

Company	Website	GitHub stars
Rocket.chat	rocket.chat
Mattermost	mattermost.com
Zulip	zulip.com
Element	element.io
Spacebar	spacebar.chat
RelatedChat	relatedcode.com

Live chat (Intercom alternatives):

Company	Website	GitHub stars
Chatwoot	chatwoot.com

User authentication (Auth0 alternatives):

Company	Website	GitHub stars
Keycloak	keycloak.org
SuperTokens	supertokens.com
Logto	logto.io

Digital search experience (Algolia alternatives):

Company	Website	GitHub stars
Typesense	typesense.org

Backend-as-a-Service (Firebase alternatives):

Company	Website	GitHub stars
Supabase	supabase.com
Appwrite	appwrite.io
Nhost	nhost.io

Customer data platform/ CDP (Segment alternatives):

Company	Website	GitHub stars
Jitsu	jitsu.com

Link shortener (Bitly alternatives):

Company	Website	GitHub stars
Dub	dub.sh

Online store builder (Shopify alternatives):

Company	Website	GitHub stars
Vue Storefront	vuestorefront.io
Sylius	sylius.com
Presta	prestashop-project.org
Bagisto	bagisto.com

Password manager (1Password alternatives):

Company	Website	GitHub stars
Bitwarden	bitwarden.com
Padloc	padloc.app

Email delivery (Mailgun, SendGrid alternatives):

Company	Website	GitHub stars
Postal	docs.postalserver.io

Usage-based billing (Stripe, Chargebee alternatives):

Company	Website	GitHub stars
Lago	getlago.com

File uploader:

Company	Website	GitHub stars
Uppy	uppy.io

Notification infrastructure:

Company	Website	GitHub stars
Novu	novu.co
ntfy	ntfy.sh
Apprise	hub.docker.com/r/caronc/apprise

API Development (Postman alternatives):

Company	Website	GitHub stars
hoppscotch	hoppscotch.io
Insomnia	insomnia.rest

Programmatic videos:

Company	Website	GitHub stars
Remotion	remotion.dev

Data warehouse (Snowflake alternatives):

Company	Website	GitHub stars
Databend	databend.rs

Annotation:

Company	Website	GitHub stars
doccano	doccano.herokuapp.com

Feature management/ Feature flag:

Company	Website	GitHub stars
Unleash	getunleash.io
Flagsmith	flagsmith.com
Flagr	openflagr.github.io/flagr/

Product Analytics (Mixpanel, Amptitude alternatives):

Company	Website	GitHub stars
PostHog	posthog.com

Video conferencing (Google Meet, Skype alternatives):

Company	Website	GitHub stars
Jitsi Meet	jitsi.org
Element Call	call.element.io

Personal cloud (Dropbox alternatives):

Company	Website	GitHub stars
Nextcloud	nextcloud.com

Business intelligence (Tableau, Looker, Power BI alternatives):

Company	Website	GitHub stars
Metabase	metabase.com

Platform-as-a-Service/ PaaS (Heroku, Netlify, Vercel alternatives):

Company	Website	GitHub stars
Dokku	dokku.com
CapRover	caprover.com
Coolify	coolify.io
Kubero	kubero.dev

Unified Communication Platform & Telephony API (Twilio alternatives):

Company	Website	GitHub stars
Fonoster	fonoster.com

Bug tracking/ Error tracking (Sentry alternatives):

Company	Website	GitHub stars
Bugzilla	bugzilla.org

Invoicing:

Company	Website	GitHub stars
Invoice Ninja	invoiceninja.com
Crater	crater.financial
SolidInvoice	solidinvoice.co

Graph database:

Company	Website	GitHub stars
JanusGraph	janusgraph.org
Memgraph	memgraph.com

Vector database:

Company	Website	GitHub stars
Milvus	milvus.io
Weaviate	weaviate.io
activeloopai/deeplake	activeloop.ai
CozoDB	cozodb.org

Time-series database:

Company	Website	GitHub stars
Prometheus	prometheus.io
QuestDB	questdb.io
OpenTSDB	opentsdb.net
KairosDB	kairosdb.github.io

Criteria

1. Product is open-source and repo is actively being maintained.
2. It is a product (not a library) and ideally has a popular closed-source alternative.
3. Repo has atleast 100 stars on GitHub.

Contributing

Looking for contributors to add missing startups/ projects. Please submit a PR (the products are listed in descending order by number of GitHub stars) or feel free to DM @deeptivchopra.