Leantime is an open source project management system. Alternative to Jira, Asana etc

Remote Desktop server/client

A FOSS Analytics provider, with builtin GDPR compliance.
https://matomo.org/

OpenFaaS (https://github.com/openfaas/faas)

Password Manager
https://keepassxc.org/

Make cards link to the live website for better UX

Web Hosting Control Panel

Graph note taking application

Matrix (https://matrix.org/)

Online text editor with grammar checker, spell checker and writing suggestions.

Helpdesk Ticketing Portal

https://www.uvdesk.com/en/

Mastodon (https://github.com/tootsuite/mastodon)

Epicyon (https://gitlab.com/bashrc2/epicyon)

Pleroma (https://git.pleroma.social/pleroma/pleroma)

E-commerce platform

https://bagisto.com/en/

https://github.com/bagisto/bagisto

Just highlighting that hyperlinks for cards were commented out

Huginn (https://github.com/huginn/huginn)

Team management

ERP Platform. POS, Accounting, eCommerce, Inventory, etc.

Sentry is as Apache licensed, but that has changed and it is no longer open source, and should be removed. see https://blog.sentry.io/2019/11/06/relicensing-sentry

For an open source alternative/fork, add GlitchTip (https://glitchtip.com/)

Feature Flag platform

We've open sourced an alternative - https://github.com/BulletTrainHQ - 100% open source BSD-3 license.d

In accordance with #22 (comment)

The title and subtitle of the home page should be changed to somthing along the lines of:

Open-source and source-available alternatives

Find open-source and source-available alternatives for your favorite apps

A PaaS provided by Google to rapidly build applications.

Last I'd looked into this the top choice I considered was Parse.

Product feedback platform

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http://localhost:8000/requests

ERPNext is a cloud, open source ERP that has been adopted by more than 5000 businesses in the world. Because of its underlying powerful framework, you can create your own version on ERP. One click easy install script, no vendor lock-in, full freedom, and a community of more than 10000 members.
Check out our website here
Our GitHub Repository

Smart home integration management

StaticDeploy, a platform for deploying static apps. Repo: https://github.com/staticdeploy/staticdeploy.

Gogs (https://gogs.io/, Repo: https://github.com/gogs/gogs)

Phabricator (http://phacility.com/phabricator/, Repo: https://github.com/phacility/phabricator)

Sourcehut (https://sourcehut.org/, Repo: https://git.sr.ht/~sircmpwn/?search=sr.ht)

Pixelfed is an open source Instagram alternative.

E-commerce platform

https://sylius.com/

https://github.com/Sylius/Sylius

Metrics and monitoring

Nutrition and exercise tracker.

Object storage

https://github.com/zulip/zulip

Sleek form builder

Flynn is another Heroku alternative I've seen floating around as an open-source competitor to Dokku

https://sylius.com/wp-content/uploads/2019/04/sylius-brand-book-v1.0.pdf

Here is the list of the ones I found:

Rudder (https://github.com/rudderlabs/rudder-server/blob/master/LICENSE)
FusionAuth (https://fusionauth.io/license)
Convo (https://github.com/hiconvo/api/blob/master/LICENSE)
Sentry(https://github.com/getsentry/sentry/blob/master/LICENSE)

None of these licenses are open source. I opened a separate issue about Sentry as it is listed as Apache, and that issue includes an alternative.

Thanks for making this resource, I hope this helps!

E-commerce platform

Business Analytics

Cloud storage (Google Drive alternative). More efficient that Owncloud/NextCloud

Edit: what I meant is that it should be added under the "Google Drive" heading

Live streaming and VOD