jEdit is by far, my prefered editor since 2010. It has a unique set of features that I didn't found in any other:
Multi OS: Win, Linux, Mac.
Portable: Just copy a folder and it is ready to use. All settings are kept in .XML and .properties files inside jEdit subfolder. This is crucial if you don't have admin rights on your enterprise workstation.
Search-Replace: The most enhanced I've seen in a text editor: Full Regex specification with Bean Shell scripting capabilities for back references. For instance: Let's say you want to apply an increment on every number found in your text (replace 1 by 2, 10 by 11 and so on). Just search for regex "(\d+)" and replace by a Java expression "Integer.parseInt(_1) + 1". It's just a simple example, but enough to show how powerful it is.
Database: Just select your SQL statement, press a button and get the resultset from MySQL, MsSql, Oracle, Teradata and any other Jdbc compatible RDBMS. Export results to csv. Works like a multi-database command line tool. Browse and navigate on your database schema. (SQL plugin).
Customization: Here is where jEdit shines. There are tons of features. The highlight is the ability to use any java API to expand it! Access them from your Beanshell scripting macros. Example: I needed a function that decode selected text from/to mime64. No problem! I Just downloaded a library from commons.apache.org and accessed it from a jEdit macro. It's just unbeliveable how expandable jEdit can be with this feature.
Highlight: Select a word or phrase and it is highlighted right away in the entire text. The mini-map of ocurrences is shown in the scrollbar. It allows quickly find, for example, a respective css style in separated file just using the mouse. No need for Ctrl+F or type anything. It works even on ordinary txt files. (Highlight Plugin)
Plugins: FTP, XML, Text Diff, Themes, Text Tabs, Highlighter, character map, Mail, Whitespaces, Abbrevs, Minimap...there are hundreds of them.
There are dozens of other nice features that I won't describe here in order to keep this answer not too long. The complete article can be found here and the mime64 example here.
At first glance, jEdit is just another text editor. The full capabilities come into light when you start playing with it's endless customization/expansion power. My initial reluctance of accepting a java-written text editor disappeared when I realize that only a java text-editor could be so extensible. Its initial drawback turned into it's main advantage.