Xint v3.5 - advanced replacement for windows notepad - a pretty good open source text editor. Main features:

Drag and Drop
Code completion
Evaluate expressions
Opens up to 10MB file. Opened 5 mb file in 2.5 seconds
Uses fairy low memory/resources
Has "most recent documents"
Encrypt/Decrypt sensitive files with Twofish - a military strength 160 bit algorithm
Prints header and footers
User-defined snippets via textfile
Exit on esc key
Fast find & replace which uses Boyer Moore Algorithm - much faster than "stringReplace"
Find in files
Go To Line
Go To End Of File
View Clipboard
Access Character Map
Insert commom delimiters with a hotkey: commas, brackets, etc.
Insert hexadecimal formatted color
Preview in default browser
Activate selected URL or filepath to open in default application
Stores user and form settings in an .ini file automatically
Extra formatting menu in system menu
File properties
Intelligent word count: selected or full text
Get byte count
Format text case: uppercase,lowercase and titlecase
Stay on top
Most functions have hotkeys
Convert Unix to Dos
Convert OEM to Ansi/Ansi to OEM
The application's title bar "rolls-up" with a right-click to caption, for added convenience
Plus quick formatting options:
turn space/tab delimited files into comma delimited csv files
turn comma delimited csv files into space/tab delimited files
strip all line breaks
trim left/right
trim all spaces
trim all spaces into one space (handy for making csv files)
encode/decode URL (obfuscate)
strip html
strip all but html (good for saving templates)
sort A-Z
Base 64 encode/decode
Base number conversion: hex/bin/dec

not bad for a notepad, ah?

System Requirements
Tested on: WINXP/2000
>600kb disk space
64 mb ram
386+

Download Xint v3.5 here for free