Yes, both Slack and Kentico Kontent offer a Free Trial.
Slack is designed for Freelancers, Large Enterprises, Medium Business and Small Business.
Kentico Kontent is designed for Large Enterprises, Medium Business and Small Business.
The starting price of Slack begins at $2.67/Month, while pricing details for Kentico Kontent are unavailable.
Some top alternatives to Slack includes Microsoft Teams, Glip, Google Chat, ChatWork, Dialog, Office Chat, imBee, Takle, SPACE Channel and Teamwork Chat.
Some top alternatives to Kentico Kontent includes Kentico CMS, Contentstack, Directus, dotCMS, Comfortable, ContentChef, Contento, BCMS, Lucidcms and Crafter CMS.