open source is the foundation of all modern software. every app, website, and system we use today is built on open source. it is the most important driver of global GDP growth, powering innovation and businesses worldwide.
but building and maintaining open source is not easy. for open source to thrive, we need a sustainable model. that's where commercial open source software (coss) can come in: one of the best ways to create open, future-proof software while ensuring long-term success.
coss.com is the new holding company of cal.com, the pioneers of open source scheduling infrastructure and cal.com continues to be the 'google search' of our alphabet.
our mission is to build a home for amazing open source projects, giving them the support they need to grow and succeed.
for developers we are building the coss stack, a one line "npm install coss" package that includes everything you need to build your application, from email, sms, calendar APIs, scheduling, video conferencing, notifications and more.
About coss.com ui on Product Hunt
“beautiful component library based on Cal.com's iconic design”
coss.com ui launched on Product Hunt on October 15th, 2025 and earned 360 upvotes and 18 comments, placing #6 on the daily leaderboard. coss.com - the everything but AI company
On the analytics side, coss.com ui competes within Open Source, SaaS and Developer Tools — topics that collectively have 620.9k followers on Product Hunt. The dashboard above tracks how coss.com ui performed against the three products that launched closest to it on the same day.
Who hunted coss.com ui?
coss.com ui was hunted by Peer Richelsen. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Peer Richelsen
dear friend,
open source is the foundation of all modern software. every app, website, and system we use today is built on open source. it is the most important driver of global GDP growth, powering innovation and businesses worldwide.
but building and maintaining open source is not easy. for open source to thrive, we need a sustainable model. that's where commercial open source software (coss) can come in: one of the best ways to create open, future-proof software while ensuring long-term success.
coss.com is the new holding company of cal.com, the pioneers of open source scheduling infrastructure and cal.com continues to be the 'google search' of our alphabet.
our mission is to build a home for amazing open source projects, giving them the support they need to grow and succeed.
for developers we are building the coss stack, a one line "npm install coss" package that includes everything you need to build your application, from email, sms, calendar APIs, scheduling, video conferencing, notifications and more.