AutoTyper is a classic typing saver program. It can replace what you've typed into any other application with some different text.
You can make for example $date typed into your word processor get replaced with the current date.
Or you could make some text be replaced by your signature, either as text or an image.
Or you could make an abbreviation get replaced with an entire form letter when typing in your email program.
The possibilities are endless for saving typing. But perhaps the best part of AutoTyper is Smart Spell. This does on the fly spelling correction in all your apps, either automatically, or with a hot key.