These are just the basic versions of intelligent chatbots. There are many more intelligent chatbots out there which provide a much more smarter approach to responding to queries. Since the process of making a intelligent chatbot is not a big task, most of us can achieve it with the most basic technical knowledge. Many of which will be very extremely helpful in the service industry and also help provide a better customer experience.

Running on Pandorabots, one of the most powerful conversational artificial intelligence chatbot platforms, Mitsuku won the award for the most human-like AI in 2013 and again in 2017. She was created from AIML, a bot language technology by Steve Worswick, who found the inspiration for Mitsuku after being asked to write her character for an internet games site.
A chatbot platform is a computer-generated software that is programmed with artificial intelligence that enables it to conduct a conversation in the same way as a human would. They are designed to handle inquiries by responding in the same as a person would. The most effective and convincing systems are incorporated with complex natural language processors (NLP) which may even display a human face look-alike and be able to understand almost any form of input, then respond to it appropriately. Simpler versions involve the use of a database where the programmer adds a list of the most used keywords. These are then detected in the inquiries and matched with the most appropriate answer which is then displayed to the user. These platforms are mostly used by large organizations to automate the customer response process. They are preferable because of their ability to handle many inquiries at once and provide the most accurate responses.
For at least the foreseeable future, chatbots won’t be replacing humans in contact center jobs. At this point, chatbots will only replace some of the tasks that people are now handling – especially lower-level requests, questions and complaints. The best chatbot systems can recognize customer frustration and switch the interaction to a human in the company’s support center. That said, chatbots are on their way to mainstream acceptance. Here are four ways AI and chatbots are creating a major impact in the customer service and CX world:
When BotEngine was released, I was an instant customer. I built and deployed bots on at least four other platforms while waiting for BotEngine and every one of those platforms was problematic. Either they weren't reliable and would malfunction without warning, or they were free and then not free and then kind of free and then not, etc, so i would gladly recommend.
Pros: The visual bot builder makes building complicated bots really easy without loosing the greater picture. And with all the functions that are offered you are not limited by what the bot can do. And things you currently can't do are worked on by the developers immediately to make the product better. It is amazing how fast they pump out great updates! 

chatterpal puja brings the power of artificial intelligence across all messaging apps including Facebook Messenger, Kik, Telegram, LINE, SMS, or your own chat screen. Native custom UI elements are used in each channel. visual bot builder gives you the power to build advanced bots as well as visually create your conversations on your own, without the help of a developer. supports human/bot hybrid which allows human agents to take over the conversation from, Zendesk, LiveChat, BrightPattern, FreshDesk or ZipWhip, at any moment and only when really needed. Analytics enable you to analyze every single response from your users…
Hmmm…interesting list. I however was thinking that you may want to include Engati as well. Engati is a chatbot platform that allows you to build, manage, integrate, train, analyse and publish your personalized bot in a matter of minutes. It presently supports eight major messaging platforms including messenger, kik, telegram, line, viber, skype, slack and webchat with a focus on customer engagement, conversational commerce, and customer service and fulfillments.
Botengine is fast and is able to respond to tens of customer chat at the same time ; which is something you don’t get with human agents.It is very easy to setup and requires basically no technical knowledge to create a chatbot on the Botengine website.The level of customer support we got from the Livechat team during and after setting up our chatbot was friendly ,prompt and continuous and I assume if we ever encounter problems with our chatbot in future ,they will be more than ready to step in and offer us assistance.

Pros: Botengine was easy to integrate with our existing Livechat helpdesk program . I am impressed with the ease at which Botengine is able to respond to the most popular of simple questions we get from our customers like; the address of the company , what we do , our subscription rates etc While these questions may appear to be straight forward , they are the most asked question which our customers throw at us . With the coming of Botengine ,we no longer need to bother ourselves with these sort of questions ; Botengine responds to them ,while we await the tough ,complex queries.

Cons: Botengine has reduced the workload on the helpdesk department . However ,I fear we may come one day have an advanced Botengine ,years down the line ; which is able to respond to the current complex queries we respond to and thus when that day comes , why would my employer keep me at the job ,when a Bot can do a better job ,without ever getting tired?