The best replacement for textpad is notepad++.

The best alternatives to textpad are rated as following:
★★★★★  notepad++
★★★★  ultraedit
★★★  wordpad
★★  pspad
★★  editpad
★  notepad
★  editplus
  jedit
  notepad 2

Your alternative for textpad is not listed? Suggest!
Speaking about textpad, one probably shouldn't forget about java compiler.

Other search terms related to textpad and their ratings are:
★★★★★ java compiler
★★ jdk
You have in mind a companion for textpad and it is not yet here? Propose!



Google Trends

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textpad
notepad++
ultraedit