Nature Direct (because I like to be thorough). This is a direct-selling organisation specialising in non-toxic, eco-friendly cleaning solutions.
One of the mandates of the company is to educate people about the nasty toxins some people spread around their homes, disguised as air-fresheners, insect spray or bathroom cleaners (to name a few). If you read the fine print or directions on many common products, you start to wonder why on earth you would use them. (I feel this way about bleach -- fume masks and tough gloves are recommended. Why would you put yourself through that?)
So it's not just about the environment -- it's about our health as well.
All Nature Direct products are pH-neutral and made from 100% natural ingredients. They are not expensive. My only complaint is that there are not enough options. At the moment you can get a heavy-duty cleaner (for bathrooms, kitchens etc), spray-and-wipe cleaner, glass cleaner, carpet/upholstery/prewash solution, and the 'EnviroMist' spray, which is a spray disinfectant. There is also the immensely wonderful EnviroAir, which bubbles away in the corner deodorising and cleansing the air circulated around a room. I think they could do with adding some dishwashing detergent as well as laundry detergent to the range.
I am still a pretty big Enjo user, but am now supplementing with some Nature Direct products. I just don't understand how anyone could use bleach et al after they've seen the alternative.