WHMCS is not on the list but it should be

Definitly WHMCS.I also have used PHPHost Bot, is not so bad.

Currently I am using ClientExec without a complaint. I have used ModernBill and it does have a lot of features, but I call it the carpul tunnel supporter, as it takes 3x as many clicks to get anything done that program. WHMCS seems pretty good too, it has a lot of features, but in the end I went with ClientExec because to me it was easier to use/look at... not cluttery I guess. But it was between those 2 in the end for ease of use, features, and cost! They are both super affordable.

client exec is what I use and very satisfied.

other than that I will prefer WHMCS.

WHMCS is does the job which we love also very easy to get it setup not hard for beginners.

My voice is for ClientEXEC, advanced and affordable as well.

I have used three, lPanel, CE and AutoPilot. AutoPilot is probably the most advanced overall of the three, but for me was a bit of work to setup. Very different.

I forget, I used phpCoin a bit to. Nice as it is free, but the admin area is rough. I understand from the last time I was at their forums they will be producing a pro version. Not sure what that means for the free version.

In general, ClientExec is the one to use.

I voted for Modernbill.

We use ModernBill its the best billing software for webhosting, provide good support and services, easy to use and has number of features. It is a complete client management solution.

Don't like Modern Bill 5, however it has some great features. Clientexec is a good option all the others are not key players but good if you want a basic one which you can develop.

We use Clientexec, perfect for what we need and gets the job done.

I don't know how support for the other billing systems compare but Clientexec also has a very active community.

We used to use iHost but only for a short while.

Even though my vote went for CE, Account Lab+ isn't that bad either.

we are using WHMautopilot and we are very happy with it

whmcs seems to be very good.

I would recommend WHMCS, which has more options than all mentioned ones here.

I voted for modernbill.

My vote has to go to WHMCS simply support great plus the fact that they are listening to their customers needs make it a great product,