Ron
Explorer
I place Green Ronin as number 1 non-WotC d20 publisher as it is the only one who actually keeps high standards in all its releases. Although, I haven't read all their books, I am still looking for one which is not good.
Second place goes to the Penumbra imprint by Atlas Games. Most of their stuff is really good.
Unfortunely, no other d20 company have impressed me with the overall quality of their products. Some such as FFG and AEG has some really good products in uneven lines, whereas some popular publishers, such as Malvahoc or Mongoose, really failed to impress me so far.
Second place goes to the Penumbra imprint by Atlas Games. Most of their stuff is really good.
Unfortunely, no other d20 company have impressed me with the overall quality of their products. Some such as FFG and AEG has some really good products in uneven lines, whereas some popular publishers, such as Malvahoc or Mongoose, really failed to impress me so far.