Planisware might be a bit more popular than Kayako. We know about 1 link to it since March 2021 and only 1 link to Kayako. 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.
One we used at a previous place, Https://kayako.com/ Small company, I'm sure there was not much effort put in customizing it. No idea on pricing but wouldn't expect it to be on the high side. Source: about 2 years ago
Examples (for Common Lisp, so not citing Emacs): reddit v1, Google's ITA Software that powers airfare search engines (Kayak, Orbitz…), Postgres' pgloader (http://pgloader.io/), which was re-written from Python to Common Lisp, Opus Modus for music composition, the Maxima CAS, PTC 3D designer CAD software (used by big brands worldwide), Grammarly, Mirai, the 3D editor that designed Gollum's face, the ScoreCloud app... - Source: Hacker News / 3 months ago
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