Addict
Addict is a professional native VCL component suite that provides end-to-end solutions for adding spelling check and thesaurus support to your applications. With Addict you can add live-spelling ("squiggly" red underline) to your RichEdit components, add a first-class spelling checker capable of... Additional Dictionaries also available from our website. ... Demos using these products can be obtained from our website. ... All of this and more can be done with only a few calls into Addict's well documented API.
http://www.addictivesoftware.com/bin/a3Trial300.exe - 3Mb - Download - Screenshot

Polar SpellChecker
Polar SpellChecker Component adds a professional spell-checking capability to your Windows-based application supporting ActiveX/COM, DLL and . NET interface. Built-in features make Polar SpellChecker Component the best choice for all Windows application developers: it is intuitive to use, yet... Key features - Easy integration with RichEdit and Edit text controls - SPT builder building Polar SpellChecker Language Tables - support for every possible language - Simultaneous use of multiple dictionaries - Support for text statistics - As-you-type spell checking and auto correction - Informing...
http://www.polarsoftware.com/downl.../downloadTrial.asp?intProdID=1053 - 0b - Download - Screenshot

Secure It!
SecureIt allows you to create and edit highly secure text messages or sensitive documents. SecureIt will open Richtext (rtf), plain text (txt) and Secure Text Messages (stm) files. STM files are highly compressed documents that can be password protected using an optional 256 bit Rijndael (AES)... SecureIt does not use the windows richedit dll file to apply formatting to your documents. ... Let's face it, in the real world many people simply aren't willing to buy and install a specific encryption package just to be able to read a couple of confidential messages you send them.
http://www.nativewinds.montana.com/downloads/SecureIt.zip - 1,006Kb - Download - Screenshot