Popup Architect is my old project for creating and installing popups easily on other websites.
I'm currently focusing on other projects and don't have time to maintain Popup Architect.
The landing page, the app, a mailing list with a few thousand contacts and a pretty solid backlink portfolio
Not much, except SEO and some promotions back in the times
Unused mailing list, software directories, PPC, SEO, referrals. Keep working on making sure paid subscriptions are valuable.
Get in touch with the owner to discuss the tech stack, market size, or just make an offer!