https://towerofawesome.org/blocklyoc/
This web application uses the Blockly library by Google to provide a block-based programming interface for the Minecraft mod OpenComputers.
It is mainly intended for programming robots.
BlocklyOC has two modes, the default Beginner Mode contains a set of simplified instruction blocks for movement and interaction with the world. Most of these cover multiple methods within the OpenComputers APIs instead of being a one-to-one mapping.
For example the "Move" instruction can generate a forward(), back(), up(), or down() call depending on the direction chosen in the Direction dropdown.
The second mode, Advanced, provides a set of instruction blocks that is a one-to-one mapping of the provided APIs. For example instead of the Move instruction in the Beginner Mode, separate blocks are provided for Forward, Back, Up, and Down.