PushCrew might be a bit more popular than Adform. We know about 1 link to it since March 2021 and only 1 link to Adform. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I would highly recommend starting from Adform or Smart. Those are quite easy to manage if you just started your journey with programmatic. Adform: https://site.adform.com/ Smart: https://smartadserver.com/demand-partners/. Source: over 2 years ago
Pushcrew.com — Push notification service. Unlimited notifications up to 2000 Subscribers. - Source: dev.to / almost 3 years ago
BuySellAds - BuySellAds.com Online Advertising Network
OneSignal - Customer engagement platform used by over 1 million developers and marketers; the fastest and most reliable way to send mobile and web push notifications, in-app messages, emails, and SMS.
CPMStar - CPMStar is an Ad Network providing advertising solutions to the gaming industry.
iZooto - Engage your mobile and desktop web users with intelligent web push notifications.
Sonobi - Sonobi is an advertising technology that offers a solution for publishers, media agencies and advertiser brands to drive results.
Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.