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2개의 이클립스를 띄우기 힘들때... 메소드 자동완성 기능 있고 가벼운 Ruby 에디터
http://www.jedit.org 여기 가시면 다운 받을수 있습니다.

여러가지 플러그인과 멀티 플랫폼 에디터더군요.
무료로 다운 받을수 있는 에디터,
기능 좋다는 평

jEdit is a mature programmer's text editor with hundreds (counting the time developing plugins)
of person-years of development behind it.

Some of jEdit's features include:

• Written in Java, so it runs on Mac OS X, OS/2, Unix, VMS and Windows.
• Built-in macro language; extensible plugin architecture. Dozens of macros and plugins available.
• Plugins can be downloaded and installed from within jEdit using the "plugin manager" feature.
• Auto indent, and syntax highlighting for more than 130 languages.
• Supports a large number of character encodings including UTF8 and Unicode.
• Folding for selectively hiding regions of text.
• Word wrap.
• Highly configurable and customizable.
• Every other feature, both basic and advanced, you would expect to find in a text editor.

See the Features page for a full list.