Ruwix.com is a website that is also currently a wiki but only recently became a wiki. It contains some of the stuff that WikiCube has, including the 17x17 and the 22x22 and lots of other stuff. Ruwix owns a lot of other websites.
Cube3x3.com is one of the websites that Ruwix owns. It has competitions for kids and the reward is $100 in Rubik's Puzzles from TheCubicle.us, Lighttake, and SpeedCubeShop, shipping fee included. Round 1 started in April 2017 and ended on May 2017. Round 2 started at the beginning of summer 2017 and will end on August 22, 2017 (EST). There is a proposed Round 3, as stated in the workbook for Round 2 provided for download, question 25.
Round 1 Edit
Round 1 had lots of writing in it, including favorite speedcuber and favorite cube. The winner of this round was Benjamin Voller-Brown.
Round 2 Edit
Round 2 has lots of summer activities in it, including watching a movie with a Rubik's Cube in it, taking a picture of a Rubik's Cube at a tourist attraction, making a new magic trick for the cube, and making a new pattern for the cube. There is no winner yet as the deadline was on August 23, 2017, at 00:00 UTC time so they are updating the site (probably for Round 3 or congratulating everyone and announcing the winner).
Round 3 Edit
Round 3 is not in action yet but is proposed to happen. This is hinted in Round 2's "workbook", question 25, where the question states "Come up with a new puzzle-related task/question for the next round of this competition." Round 3 may or may not be Round 2 themed, as school starts in September and Round 2 was summer-themed.
This solving page includes a cube in 3D or a net of the 3x3 cube where anyone can put their scramble on; the page can tell whether the position is unsolvable or not by calculating solutions in less than 30 moves (mostly under 27). It also calculates the layer-by-layer solution if this takes too much time. This site also teaches you how to solve the cube.