I wish to dapple in Ethereum and am looking for a software wallet that has all the features of Electrum and more:

1. works on the laptop or desktop machine
2. Linux, Mac OS, Microsoft Windows (in that order)
3. option not to install it on Linux (Electrum has this feature)
4. free and open-source
5. large community support like [phishing] if and when I need help with your recommended software wallet

Thanks in advance for your recommendations.