Corralling multiple drain hoses
You can get it condensate pump or multiple condensate pumps to handle all the drain lines and pump them into a laundry tub or another suitable location. It's one more link in the chain that can fail and you have to check the capabilities of any condensate pumps that you are using in regards to flow rate and holding capacity. Your T&amp;P valve should be pipes to the floor within 6 inches of the floor and not pipes to a drain or condensate pump the idea being if there is a drip or a leak from there it gets noticed and repaired. Water softeners will all often flow more than what they condensate pump is capable of handling. A higher flow pump I'm sure is available. 

Condensate pump

Amazon

This one looks like a pretty heavy duty condensate pump. For a hundred and fifty bucks with a 4.5 gallon per minute rating seems like a pretty good deal it might be up to the task. Not for the washer though. They can dump like 15 gallons per minute.