Bitcoin Core Client
The original, open-source BTC node software written in C++, contains the entire BTC blockchain.
Offline, Paper, Cold storage
Bitcoin Core Client alternatives
Electrum BTC Wallet
Has a longstanding reputation with the community, now available on most platforms.
Bitcoin Paper Wallet
The premier BTC cold storage means, generates paper wallets and keys using client-side software.
Client-side, web-based Dogecoin wallet that allows for the creation and import of paper wallets.
Highly regarded in the bitcoin community, this is an easy-to-use, web-based wallet.