Apache Isis might be a bit more popular than Pega. We know about 1 link to it since March 2021 and only 1 link to Pega. 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.
Pegasystems is an actual company that has been around for many years. Their website is pega.com and they have a bunch of remote worker positions listed on their website. Source: about 2 years ago
Regarding django-admin style tools, there are solutions like zk [1] & apache isis [2] for java which are somewhat comparable, though more enterprise oriented. [1] https://www.zkoss.org/ [2] https://isis.apache.org/. - Source: Hacker News / about 2 years ago
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