Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.
Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).
I need an open-source and multi-chain Bitcoin wallet, so suggest some reliable options, and also tell me what the main security concerns are to consider when I am selecting a wallet with infrequent updates or inactive developer communities.