There are many tools on the market but none of them provide a full solution and a true, efficient automation.
They are, in general, just chrome extensions which require a constant involvment of the user forcing him to invest time in performing limited procedures.
Some tools grants real automation but are crazily expensive.
The solution, if you are looking for an affordable, solid instrument is socializit.com.
There are many reasons for that.
First of all it is unexpensive and, at same time, totally reliable but the main reason is that it allows a complete management of multiple accounts without any human intervention.
Socializit.com is the best linkedin automation tool and has so many feature you will love.
You will be able to search job in autopilot, to create self-managed group lists, to setup unlimited lists of people.
Basically the follow are the necessary steps:
Do a research (Socializit reflects research kind of LinkedIn)
Naming the list created
Add a Bot
Apply your preferred settings: the bot will execute them in auto-pilot