Program for Android-based devices is the official website of Google: https://play.google.com/store/apps/details?id=de.schildbach.wallet_BUGS
Source code is available here: https://github.com/rkarpuzov/Ladybug-pupa latest stable version 0.12.
git clone -b 0.12 https://github.com/rkarpuzov/Ladybug-pupa.git
Ready-to-use program for Windows OSs is available here: https://drive.google.com/file/d/0B0QXXM_E1E1FRzZURDMxVlY2bUk/view?pref=2&pli=1 thanks to 2GOOD (outdated version)
You can store for long periods without the need for a computer in a paper portfolio. Proven and tested methods. The drawback of it is that you need to enter the private key into the program manually or use a program to read out the QR code. Currently only program for Android supports QR code reading, but its use is extremely easy to her. Paper books you can use here: https://cointech.net/paperwallet/ladybug.html
Official wallets full node:
In most cases you must execute only the program located in bin / bitcoin_qt