There are several good open source Bitcoin wallets available for both desktop and mobile devices, but situation is not that great for people who want to use one wallet for multiple coins.
Many people used Coinomi wallet for years but they changed the source code and developers are not maintaining it anymore.

I decided to start working on creating a list of Multicoin Wallets that are open source or with similar source available license.
There won't be any rating in my list, but I will write my short review for most of them with pros and cons.

Any wallet in this list must support Bitcoin mainnet BTC along with other additional coins!

Desktop wallets::

• OneKey desktop wallet
• Stack desktop wallet ^{(coin control, tor)}

• Komodo desktop wallet
• Uniblow desktop wallet
• Cake wallet ^{(coin control, tor)}

• Coin wallet

Mobile Wallets:

• OneKey mobile wallet
• Stack mobile wallet ^{(coin control, tor)}

• Komodo mobile wallet
• Cake mobile wallet  ^{(coin control, tor)}

• Unstoppable mobile wallet
• Mycelium mobile wallet
• Coin wallet mobile
• AirGap mobile wallet

Wallets for Bitcoin and Liquid assets L-USDT and L-BTC:

• Aqua wallet
• Green wallet
• Specter wallet
• Jade HW

Note that safest option for this purpose is to use hardware wallets like Trezor, Bitbox, Keystone, Onekey, Satochip, etc.

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This topic is work in progress, and it is opened for discussion.

Every contribution is appreciated so please post your suggestion for other open source wallets.

That is because the wallet isn't open source (for now[1] apparently). As a curiosity, this wallet was originally launched by Blockstream in 2020[2] but when Samson Mow - the author of the tweet[1] and ex executive of Blockstream- left the company in 2022, he managed to raise funds to create a new company called JAN3[2]. Probably he used some of the funding money to buy AQUA wallet? Apparently a user in Stack News sent JAN3 an e-mail inquiring about the release of the code[3] and they told that it would happen next week. I guess we will have to wait and see.

PS: It seems to exist an open source wallet called Aqua Wallet (instead of AQUA wallet)[4]. Perhaps dkbit98 was talking about this one? Probably it wasn't the case considering that this one is for ETH ...

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[1]https://nitter.net/Excellion/status/1742847525177131017
[2]https://blockstream.com/press-releases/2020-09-28-blockstream-launches-aqua-a-new-bitcoin-liquid-wallet/
[3]https://stacker.news/items/388269
[4]https://github.com/atilatech/aqua-wallet

It's a very interesting topic thanks you for the idea but it would be interesting to know which wallets of the list support Web3 connection to DApps too. And which main cryptos(not all ofc) they are offering.
As mobile wallet, there is Alphawallet, which is open source but it only supports EVM blockchains.
https://alphawallet.com/

The only wallets I've tried are Cake wallet, Mycelium, and Unstoppable. I haven't heard of the rest, so this would be a good opportunity to try some out.

Aren't L-USDT and L-BTC the same as wBTC, in which Bitcoin is locked in exchange for tokens and therefore we consider it an altcoin? It is not always possible to guarantee 1:1 or am I wrong about it, I have no experience with Liquid assets

IMO current is what is in github (or wherever) can be compiled to be what is in the playstore / downloads / whatever.
As I pointed out for a while you could take what coinomi had online compile it and you got the same binary download that they were giving giving you.
At some time that stopped.

Too many people, myself included, may check once or twice that what they are giving me is what they say it is and then never check again.

-Dave

I don't know much about wallets, both desktop and mobile versions.

The open source desktop version of the wallet that I use is only Electrum and plan to try Bitcoin Core by completing the full synchronization (Sync) even though I know it will take several days to complete 100% according to friends who have completed it.
There is Wasabi which is familiar to me but I have never tried it.
This wallet is not a multicoin wallet.

The mobile version of the wallet that I have used is BlueWallet but it is not a multicoin wallet. From the list in the OP, only unstoppable is the one I still use on my mobile to store several assets, but in my unstoppable wallet I don't store Bitcoin.

Here, I don't have any suggestions as to what I want, I just want this topic to be active so that I can find out more about open source multicoin wallets by reading all the discussions that come in.
Learning from greater people can have a great effect on my knowledge.

I wonder why the Ledger Nano S was on your list in the first place, considering that it's not an open-source wallet, and the topic title is about open-source multicoin wallets.
Did Ledger drop support for liquid assets following a new update to Ledger Live or what happened there. I am running an older version of LL on one of my laptops so I will check later if the app is still there. I am curious where you read that it's no longer working. I have no reason to doubt it's not true, but I couldn't find any sources after a quick check. Is it reddit or something like that?

This is not true.
I generated multiple Bitcoin addresses with Stack desktop wallet, and I can confirm they are  P2WPKH aka Bech32 that is starting with bc1q.
In Cake desktop wallet you can easier choose between different type of addresses including Silent Payments.
I think that Stack wallet is a fork of Cake wallet, so they are similar.

Yeah, you can even create multiple Bitcoin wallets with different seed phrases.

I don't know because I don't try it. But someone has answered it which I consider to be finished on your question.
I will not try many types of wallet versions of the wallet because I only use one desktop except on mobile. The reason is that I am afraid something will happen outside of my control.

Something that I don't know will not answer to avoid mistakes that can mislead others for the information I said.

Thank you @OP for the answer. It's also useful for me.

OneKey software wallet really seems to be very awesome. I have yet sent funds back and forth, but from the first glance, it's one of those wallet for the people.
My question is, do we have an option to change the address type from nested segwit to native segwit. Nested Segwit seems to be the default address type when one creates or imports a wallet.