My favorite EOS Voting Portal:
since EOS genesis-block phase (15 June 2018): eos-voter (https://github.com/greymass/eos-voter)
Developed by: greymass (https://greymass.com/ )

Reasons:

1. EOS Community trusted and endorsed. Join: Discord Server EOS-talk (https://discord.gg/AgxqnS)
2. Simple to use & download from official depository on Github. https://github.com/greymass/eos-voter
3. BP candidate's I trust, such as EOSTribe (amongst others) endorse eos-voter (https://eostribe.io/)

The fist-time use of Downloading the dAPP, wallet creation and making votes took about 5 minutes. Instructions are easy to follow. You'll need your public & private keys ready.

Simple and effective features include:

1. Block Producer Voting: a simple interface that provides a secure way to vote.
2. Token Transfers: Transfer EOS or any other token you may have a balance for to another user or exchanges.
3. CPU/Bandwidth Staking: Stake your EOS as either Bandwidth or CPU. This grants rights to resource usage on the network, in addition to conveying weight while voting for block producers.
4. Local Wallet: Your key will be encrypted locally using this password. This password will be required each time you need to unlock the wallet.
5. Temporary Usage: If you prefer not to store your keys within the application, simply choose not to set a password. When the application quits, your key will be forgotten.

This one just happened to be presented to me and researched at the right time for the Genesis-block activation. So it's the one that I ran with and I know is safe.

Greg.