Auto Delegator

I've done this in the past by using the Sync Lead to SFDC with a series of choices with an 'If Email Address starts with [series of letters]' or 'If Company Name starts with [series of letters]' then Assign To: [user name].  This is maintainable when you have less than a couple of dozen salespersons.  You would need to export and sort all (or a large random sample) of your Leads / Accounts and determine which ranges of ASCII characters result in an equitable distribution to the sales team.

If you're really only talking about leads created via a form, it's quite easy to have a random (though not in fact round-robin) distribution of leads to the sales team.

You can use a hash-bucket algorithm -- the same thing we do in server-side code -- in JavaScript when they submit the form.  All you need to know is the total number of salespersons, and each lead will be assigned a # from 1 to N stored in a field on the lead.  Then in a Flow you can set #8 = Adam, #11 = Elliott, etc.

The difference between this method and round-robin is that while the even distribution is guaranteed over time, it is possible for more than one lead in a row (chronologically) to go to the same salesperson.  But assuming you get more than, say 3 * N form submissions, all salespeople will get their share.

And the difference between this method and full randomness (just choosing a # between 1 and N, which could also be done in JS extremely easily, when the form is submitted) is that the hash-bucket method is rebalanceable.  What this means is that if you go from 10 to 15 salespeople you can use the same method to spread leads out more.