Xfce4 terminal might be a bit more popular than ClusterSSH. We know about 1 link to it since March 2021 and only 1 link to ClusterSSH. 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.
As to your problem, in addition to other answers, cluster ssh is also free -> https://sourceforge.net/projects/clusterssh/. Source: about 2 years ago
Googling a bit about xfce4-terminal you can find this where it mentions that it is based on VTE project. Then, I searched about its color palette and found this. Source: almost 3 years ago
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