Disclaimer: Dune 3D developer here.

I doubt that they use any kind of reprogrammable memory, but you can swap out the entire board like I did: https://github.com/carrotIndustries/pluto

Comments URL: https://news.ycombinator.com/item?id=23977786

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No, but there's been some discussion on it: https://github.com/horizon-eda/horizon/pull/347#issuecomment...

> 2. In the docs it seems to mention submitting parts to the default pool. If people submit parts to the pool are there style guides somewhere?

There's https://github.com/horizon-eda/horizon-pool-convention, but that's still work in progress.

> 3. Is there a way to set paste mask expansion like is done in Altium?

Yes, you can set it globally in the board.

As far as I can tell, the development models also differ significantly: The LibrePCB devs seem to be focused on doing things the right way the first time such as having a proper operation-based undo/redo stack whereas horizon just stores a copy of the whole schematic/board for undo/redo. They also seem to focus more on simplicity for beginners rather than more advanced features such as length tuning and advanced design rules.

Putting development effort where I like enabled me do to the board for my master thesis https://github.com/carrotIndustries/x-band-tx/ (4 Layers, differential pairs, length-matched traces) in Horizon EDA only after about 2 years after the initial beginning of development.

Yes, uses KiCad's push&shove router

> Pin swapping... ie a differential pair where the pins can be reversed

Not really, but swapping P/N in a diffpair is as easy as selecting nets in the schematic and using the "swap nets" tools.

> Pin agnostic routing, ie a MCU or FPGA where it doesn't matter which pin is used

Not really, but you can draw the connections in the board editor and backannotate them into the schematic: https://horizon-eda.readthedocs.io/en/latest/backannotation....

> Incremental part placement, unlike kicad where all the footprints get dumped on the board in a big mess at the start

Yes, there's list showing all currently unplaced packages: https://imgur.com/ZrvRw46

- library management that makes sense (though is a bit more complex than KiCad's)

- clean and modern UI

- fast-paced development (if there's a suggestion, that makes sense to me, I'll implement it)

pro KiCad:

- large library of parts

- has been around for a long time, so for every problem you may encounter, there's likely a forum post or so that describes a solution/workaround

- larger community

Starting from scratch also allowed me to trivially implement features that KiCad is missing, such as proper panelisation: https://blog.horizon-eda.org/progress/2020/04/05/progress-20...