Desktop Wallets for altcoins crypto's other than the mainstream

[xiats]

I already found desktop wallets which can work with BTC, ETH and others altcoins such as Golem or Litecoin BUT

I would like to know if there is an app for desktop which can support other currencies such as:

Zcash
Monero
Xem   
Nem
Stratis
Siacoin
Peercoin
Lisk
IOTA
Waves
Ripple
BAT
and others...

Of course if it could be one app that accepts them this would make everything easier.

If these are not possible or too many separate wallets need to be created I suppose Exchange sites are safe enough, right?

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[rytyr]

There are quite a few of them as of now.
The ones that I have seen are Coinonmi and exodus.
There is another I found yesterday but the name of it just slipped my mind.
Will update this post after going through my bookmarks I made recently.

[TryNinja]

I will suggest you to check out https://www.cryptocompare.com/wallets/#/overview to see almost each wallet available for every top 20 coins in the market.

Zcash
Stratis
Peercoin

From the coins on your list, Coinomi for android will support the ones above. For BAT, I recommend you using MyEtherWallet.

If these are not possible or too many separate wallets need to be created I suppose Exchange sites are safe enough, right?

Exchanges will never be a safe place to store your coins. If you can, use a wallet for every coin you want to store. If you don't have any good option, you may do this. But keep in mind that you are always risking all your portfolio by storing them in an exchange.