[netghost]

I have to say, I really enjoy TextMate's autocomplete word. It's not fancy, but it saves me tons of time.

Also, not listed there, but TextMate's autocomplete word can also be used with [Shift - Esc] for the reverse direction.

[iamjs]

For vim users, Gary Bernhardt's vimrc has a nice little snippet to map the tab key to perform completion if the cursor isn't at the beginning on a line.

https://github.com/garybernhardt/dotfiles/blob/master/.vimrc...

You use tab for completion in so many other contexts, it's nice not to have to break that habit in your editor.