What are good toys for kids who like to build things in addition to blocks and legos?
You mentioned in addition to blocks, but our kids have gotten a lot of enjoyment out of less-mainstream blocks, so we are mentioning those as well.
We like pixel blocks for small stuff– these are like single unit legos that can be attached via the sides as well as the top and bottom. (The somewhat lower than expected reviews are because, unlike lego, their quality control is not perfect and some of the blocks don’t fit perfectly.)
A very simple version of blocks are Kapla blocks. I don’t know why these are so fun given that they come in just one size/shape, but they have provided hours of entertainment for all ages.
Tegu blocks, which are slightly magnetic, continue to be really awesome.
For little kids, HABA makes a lot of fun versions of blocks that are a bit different from ordinary blocks in different ways.
Train sets are also many hours of building fun. Brio makes a good one that is interchangeable with some other sets.
Ozobot was great for like a week and then the kids completely lost interest. Probably not worth the expense. (Note: this starter kit is 2x the cost of the one we got!)
Snap circuits had longer staying power but they ended up getting scattered all over the house and stopped being used.
Our favorite science kit so far has been the Magic School Bus chemistry version. It’s fun!
A pack of playing cards and access to youtube videos on how to do card tricks has kept DC1 entertained for days on end.
The fun and healthy kids’ cookbook is a good one.
DH and DC2 are both hooked on pixelhobby. (This is not a cheap hobby, but the output is nice enough to become Christmas presents for other people.)
These fascinations metal earth kits also result in really nice output (DC1 made the lighthouse one for MIL last year), but you do need needle nose pliers.
Binoculars are cool.