There is also Methylated Testosterone(Methyltestosterone), which has different properties than testosterone itself, however. The 17-alpha alkylation not only renders the compound more bioavailable, it also alters the behavior and characteristics of the steroid itself.
Andriol is actually pretty good stuff as a secondary form of Testosterone, if you can get your hands on it. For example, I ran 1 shot of Sustanon(250mg) per week, and then also took a daily dosage of Andriol. I have also used the same method with Androgel, which is transdermal Testosterone.
In my experience, utilizing Andriol and Androgel is this way reduces aromatization, leading to better quality gains compared to a single esterfied injectable.