textify
Textify - Ramen Software
WindowsTextCopyer
Windows Text Copyer - 窗口文字复制工具 - 小众软件
GetWindowText
GetWindowText 4.94 A tool to read the window title and text
WindowTextExtractor
https://sourceforge.net/projects/windowtextextractor
上面这几款软件都可以，做的最好的是textify