25DaysOf - A customizable advent calendar, for everyone
SE Ranking - All-in-One cloud-based SEO software for agencies, marketing teams and webmasters
Frozen Goodies - An advent calendar to get the chance to win daily prizes
DeskAlerts - Send alerts to any corporate device: PCs, phones, tablets, etc.
Syndical - Automatically publish events across a range of platforms
SEMRush - All-in-one Marketing Toolkit for digital marketing professionals.