The best replacement for kdevelop is qt creator.

The best alternatives to kdevelop are rated as following:
★★★★★  qt creator
★★★★★  codeblocks
★★  codelite
★★  geany
★  anjuta
  qtcreator
  qdevelop
  code blocks

Your alternative for kdevelop is not listed? Suggest!
Speaking about kdevelop, one probably shouldn't forget about kde.

Other search terms related to kdevelop and their ratings are:
★★★★★ kde
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kdevelop
qt creator
codeblocks