Vendure is an open-source e-commerce framework targeted at JavaScript developers. It's been under development for almost 2 years now.
At the suggestion of a friend, I did a "soft launch" by posting to Hacker News and Reddit.
The Hacker News link was swallowed into the void. 3 upvotes, a couple of comments and about 20 visits to the GitHub repo. Posted around 11am CET Tuesday morning, so maybe the timing was off (US was asleep).
Reddit, on the other hand went really well! My friend posted it to /r/JavaScript (812k members) yesterday afternoon (https://www.reddit.com/r/javascript/comments/ez9bex/vendure_an_open_source_magento_alternative/). The post went to the top and currently has ~100 upvotes and a bunch of positive feedback and interest!
Also resulted in about 50 extra stars on the GitHub repo, which always helps.
Very encouraging!