Celtra, heaquartered in Boston, offers their creative management platform (CMP) to support digital advertisers with well designed display, interactive, or video ad templated creation, with collaboration tools to support the ad design process, and analytics to guide the creative process.
I recommend it because it has been simple to use, it is fantastic, and for all beginners, it adapts. The software reinforces a simple way to create a marketing creation plan. It integrates excellently. You will feel comfortable using it and have a highly-skilled program at your disposal. It is excellent for companies with creative goals.
I've really exclusively used this platform for rich media creation. There are other platforms out there for native advertisements such as TripleLift, which I've used in the past, that stacks up pretty well to Celtra. Truthfully we don't use any other ad creation platforms except for Celtra. We have had the option to work with Teads, but ended up not.