While these products look rather like energy gels, they don't meet my criteria for inclusion but are worth mentioning.
Unlike energy gels, [http://www.amazon.com/s/ref=nb_sb_noss_2?url=search-alias%3Daps&field-keywords=PocketFuel&rh=i%3Aaps%2Ck%3APocketFuel PocketFuel] is a peanut butter like paste in an energy gel like packet. They are similar a little larger than most other gels (about 1.8oz/52g) but have far more calories (~280) due to their higher fat content.
(Be careful of the nutrition label, which quotes values for a 32 gram serving, even though the packet contains 52g. The label says each packet contains "about 2" servings, but is actually 1.6 servings. ) I would not generally recommend PocketFuel for runs shorter than about 40 miles, but for longer races they make a convenient form of food. Note that for some flavors the ingredients tend to settle and it's worth squishing the packet before your run to mix things up.
[[File:Gels-Pocket-Fuel.JPG|none|thumb|500px|Pocket Fuel (with a Gu as a size reference)]]
''<br/>Ingredients (chocolate haze):Hazelnuts, almonds, sugar, cocoa powder, sunflower oil, organic palm fruit oil, sea salt.''
==PowerBar Performance Energy Blend==
[http://www.amazon.com/s/ref=nb_sb_noss?url=search-alias%3Daps&field-keywords=PowerBar+Performance+Energy+Blend+ PowerBar Performance Energy Blend] (PEB) almost made it into my list of gels. It looks like a large energy gel, with a re-closable a screw top. It's actually about three times the size and weight of a standard gel like Gu, even though it contains less calories (80 Cal). The reason for the low energy density is that it's a mixture of fruit puree and glucose. If you've ever eaten apple puree, you'll know what PEB is like. I found PEB to quite pleasant, but the size and lack of calories means it's impractical to carry enough while running.