Our company uses just 2 of them - Website Auditor and SEO SpyGlass. Website Auditor is an excellent tool for crawling your website and finding onsite and technical errors. SEO SpyGlass is a great tool for offsite SEO optimization and competitor research.
SEO PowerSuite is a one-time payment SEO software which shortens the time it takes for you to optimize websites in terms of SEO, content, visibility and conversions which can improve your ROI if used wisely.
Can be used on multiple platforms and scales nicely. An Enterprise license allows multiple people to run the software, and it's easy to set up. It's updated regularly which means zero maintenance.
BuzzBundle and LinkAssistant can increase your brands reach, potentially increasing the number of prospects and leads.
SEO PowerSuite is a unique SEO software because it runs on your computer. Unlike Ahrefs or Moz, which run as SaS, this tool depends on your computer resources to crawl and gather data from the websites which can be a good thing, because your business lives on your computer. This can also be a negative thing because Google sometimes show their "captcha" since they recognize your machine as a crawler.
PowerSuite recently improved their SEO SpyGlass' link index and now compete with the big dogs, such as Moz and Ahrefs and SEMrush, but not Majestic.
They require you to pay a monthly fee for their "algo updates" which increases the cost of their "one time payment" marketing model.
SEO PowerSuite offers tools for a complete SEO (technical, onsite and offsite). It's a good tool set with good support and regular updates.
If you're a one-man show, you can use their Professional license and if you're an agency, there's an Enterprise license with white-label reports and cloud storage for all your 400 clients (which is their limit).