Bitcoin & Cryptocurrency
This section lists cryptocurrencies, such as Bitcoin (the first widely adopted cryptocurrency), as well as tools to help manage and keep track of them. Digital currency is decentralized, meaning that it functions and operates without a central banking system or governing authority. This category includes many of the hundreds of cryptocurrencies in circulation, as well as tools such as digital wallets and price trackers in order to help manage them.
Most popular apps

Bitcoin
Bitcoin is a peer-to-peer digital currency. Peer-to-peer (P2P) means that there is no central authority to issue new money or keep track of transactions. Instead, these tasks are managed collectively by the nodes of the network.

Monero
Monero is a digital currency that is secure, private, and untraceable. It is open-source and freely available to all. With Monero, you are your own bank. Only you control and are responsible for your funds, and your accounts and transactions are kept private from prying eyes.
Proton Wallet
Proton Wallet is a self-custody wallet, meaning we use end-to-end encryption to ensure that you are the only one with access to your wallet's encryption keys.

Rabby Wallet
Open source crypto wallet for 100+ chains, featuring auto-chain switching and pre-sign security checks on Android, iOS, and desktop platforms.
openHAB
openHAB is a Java-based open-source home automation platform that integrates and combines a vast range of different smart home systems and technologies into one single solution.

Electrum
Electrum is an easy to use Bitcoin client. It protects you from losing coins in a backup mistake or computer failure, because your wallet can be recovered from a secret phrase that you can write on paper or learn by heart.

Ethereum
Ethereum is a decentralized platform that runs smart contracts: applications that run exactly as programmed without any possibility of downtime, censorship, fraud or third party interference.

Bisq
Desktop peer-to-peer (P2P) application that allows you to buy and sell bitcoins in exchange for fiat (national currencies), or alternative crypto currencies