I think you mean Autotalker? Autotypers just spam the same (or a list) of sentences repeatedly, which Jagex have done a pretty good job of automuting and banning some of these accounts using these autotypers.
Anyway, I'm sure there are various bots with autotalkers out there, but I doubt they are untrickable (meaning, let's pretend Jagex went up to one, and was able to predict exactly what the bot would say under certain circumstances, or even trick the bot into saying what they want it to say, or say something as many times as they want to say it, that would be a trickable Autotalker).
I am aware of one site that has built-in autotalkers that are untrickable, however they only have 2 free bots. They have 10 (soon to be 11) premium bots, and its possible to bot up to 19 skills to 99 there (so far; the owner intends to make a bot for all skills eventually).
In order to minimize the bot and use your computer at the same time, you would need to follow their free easy-to-follow, step-by-step guide for how to do so, located in the Extras section of the Knowledgebase. It's called 'How to Minimize Your Bot'
The bot's safety is backed by an unparalleled ban history. In over 4 years there have been 0 bans following the website's botting Guidelines, and only 48 bans in the same 4 years of users breaking Guidelines. From 2008-2011 over 600,000 hours were botted by the community, with only 37 bans (Guideline breakers). The 2011 bans were followed by over a year of no bans, regardless of Guidelines being followed or not. There was 11 bans breaking Guidelines this year, and those were not until late September, and all of them were manual bans, meaning the automated systems did not catch them. All of the bots are currently down, due to the owner/only programmer prepping version 2.0 to be released, which will be better and safer than ever. v2.0 should be released within a week or two. The first bot of their 12 to be released using 2.0 technology will be RiDiverse (can bot cooking, herblore, fletching, magic, smithing, crafting), which should be around Wednesday or so. It might be getting tested by Veterans (botted 1,000+ premium hours) first, but that won't take very long.
I've used their bots for 14 99s on my main, and 99 fletching on a def pure. That's nearly 3400 hours of botting, and no offenses on my account in over 2.5 years of botting.
Also, in case you are interested, despite only have 2 free bots:
www.robotzindisguise.com
I'm going to show a few pictures of my bot's autotalking records (the website has a location that stores all of your bot's talking records, and it has a feature that allows you to see 3-4 handpicked autotalking examples that came from real in-game situations while running the bots) after this post, so gimme a minute.
EDIT:
Here's some pictures of my autotalker records:
MTA
Powerminer
Blacksmith
Here's some from the database:
RiD bots, rejecting girls like a boss:
Full conversations like a boss.
Bot with auto typer?
