For those of you looking for the features of the TextMate’s Browser side menu with dropdown folder view.
For Linux, I use gEdit.
Here are the instructions for configuration.
1. Open gEdit.
2. Click Edit->Preferences.
a. View Tab.
. Click Display line numbers.
b. Editor Tab.
. Tab width set to 3
. Insert spaces instead of tabs clicked
. Enable automatic indentation.
. File browser pane clicked
. And any additional plugin you would like.
4. Click Close
5. Restart gEdit
6. Click View->SidePane
7. Bottom of SidePane will be a file cabinet click it then browse to your base folder then use arrows to open folders below the root and double click files to open.