give us an idea of what the ram/cpu limits are

i am also interested

you can run some stuff off of that, i'd look for things that are light on memory requirements.

• IRC servers run light, probably other chat servers minus matrix
• java/i2p+ can host personal sites and have plugins for blog and zzzot open tracker with no extra overhead. You can reduce the wrapper memory usage. new zzzot uses less memory so i think if you give the router 256mb it should do fine, but can't confirm
• js-free filehost or pastebin
• books
• radio
• privacy frontends: we have lots of reddit ones now, how about a more rare one like libermbd or soundcloak

I have no experience with mixing Raspberry Pi and OpenBSD, but my default go-to is Void Linux, in my experience the best operating system you can install on a RPI, Void has a really fast package manager, even on slow SD cards. One of my redundant I2P routers is running on an RPI4 like yours, though I got 4GiB of RAM, works like a charm.

that'd be cool. irc.nerds.i2p has something similar sounding on http://radio.nerds.i2p/, code for that could be available somewhere, not sure, but gives you some controls in the channel

songs can sort of be requested from http://guessthesong.i2p through playing the game in irc2p, they end up in music.simp.i2p. the code for the ircbot is jank but it's up so you could strip out the game parts and turn it into a music request bot

also just came up in #simp, if you have a safe way to bridge to larger clearnet networks, that could be useful. could help with setup if it's something you want to do

A search engine of only i2p stuff

I would really like someone to kick-start radicle nodes over i2p. ( clearnet link : https://radicle.xyz ) It's like git, but decentralised. Imagine hosting uncensorable git repos that are distributed all over the network. Things like Nintendo shuting down emulators would not be possible. The idea behind it is basically made for I2P.

You would need however a webpage to advertise your node id and it's a little bit tricky to set-up over i2p. IDK, the current maintainer of the java version has proposed a tutorial that still hasn't made it on the official webpage : (another clearnet link : https://app.radicle.xyz/nodes/seed.radicle.xyz/rad:z371PVmDHdjJucejRoRYJcDEvD5pp/patches/18e6ec1dd5e87e39223ceade8e016107937ab1c3 )

Another fun thing to try out would be hosting a reticulum node over I2P ( https://reticulum.network ), which you can bridge with the clearnet. Reticulum is a network stack that allows you to have a network over essentially anything, from the regular internet, ham radios, LoRas, and yes, I2P. You can build networks of networks with it.

Then, tutorials... content in general. Looking for information not available on I2P that /is/ on the clearnet? Have a go and make a webpage about it!

I can't reproduce, mine is up to date. However I am using glibc rather than musl and that likely has a lot to do with package maintenance and versioning.