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Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

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Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#121
post #90

I built a website which offers real-time statistics for Philadelphia's Regional Rail train system: https://www.septastats.com/ This lets public transit passengers answer questions like: - "My train is getting later and later, is it actually moving?" - "My train is getting later and later, has it actually STARTED its journey?" (sometimes the answer is "no", sadly) - "Is it just my train, or are many trains running lat…

Neat.

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#123
post #90

I built a website which offers real-time statistics for Philadelphia's Regional Rail train system: https://www.septastats.com/ This lets public transit passengers answer questions like: - "My train is getting later and later, is it actually moving?" - "My train is getting later and later, has it actually STARTED its journey?" (sometimes the answer is "no", sadly) - "Is it just my train, or are many trains running lat…

As a Philadelphian, this is pretty awesome!

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#124

Earlier quoted context omitted.

The trading bot sounded fun. I was always curious about the bots that were apparently used on betting sites like betfair to perform arbitrage.

I one quadrupled my capital with a betting bot running a martingale strategy. Then I made it run overnight and lost all the funds. Turns out there aren't any betting strategies that can last over the long run. With a martingale strategy the chances of losing are miniscule but if you play 10,000 rounds at a 0.01% of losing, you're going to lose once. And that's when you lose all your capital.

I don't think the fact that your coin-flip martingale strategy didn't work is evidence that "there aren't any betting strategies that can last over the long run".

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#126
I built https://www.liquidityapp.com/ over the summer of 2015: "Liquidity is a smartphone based currency built for Monopoly and all board and tabletop games.", and I actively maintain it. I have enhancement ideas too, but I barely have any time to put into it these days so it is primarily just maintenance.

It's one part Android client and one part Scala backend (though there's some Scala in the client too). While I'm fairly pleased with the UX and UI I was able to create (given that I really don't consider them my speciality), the backend is the bit that keeps my interest now. That uses Akka, Akka Persistence (i.e. it's event sourced), and Akka HTTP among other things. The clients communicate with it via websockets.

The details aren't exposed to users but it uses public key authentication so as to not burden users with passwords/PINs. Each app generates a keypair when first used, and QR codes are used to make changing account ownership simple.

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#127
I'm working on collating as many sources of Canadian federal data into a single relational database, and exposing that data via a public API.

https://api.iscanadafair.ca/

Given the sources of this data, I'm pretty sure I'm not even allowed to profit off of this. Not really a problem as I'd be doing this in my spare time anyway.

The data-visualization side of it (e.g. https://iscanadafair.ca/data-visualization/example-usage/) isn't my strong-suit, but it's fun to muck around in regardless.

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#128
Together with an old study pal I've built a platform for students in the Netherlands to find housing: https://www.roombase.nl/

We've never made any money with it, it's only costing us money. Learning new techniques and seeing the site being used makes up for that.

Re: Ask HN: Projects that don't make you money but you're doing it out of sheer joy?

#130

Working on a proof of a modular exponentiation algorithm in Lean with a focus on performance. Hoping to be able to extract a low-level ASM or C implementation from the proof.

Any chance you'd have a link to a repository where you publish your work ?

I'm not working alone on it. Publishing my work at https://github.com/agentultra/lean-modexp
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