user62619: I'm looking for a library or method to generate addresses for as many of the most popular currencies/altcoins as possible. Is there a known library that supports this? Or do I need to use a specific client for each coin?
Thanks!

user67098: Here is my "quite big answer":
I've successfully used http://cryptolife.net/upwg/ which is stated to be "Open Source JavaScript Client-Side Universal Paper Wallet Generator".  
It doesn't generate wallet addresses by coinname, but instead by the leading character within the wallet address.  I get these from the block explorer for the coin, looking at top address.
http://www.universalwalletgenerator.net/ lets you do it by coin name.

user10377: You should find libbitcoin's bx command line interface to be quite useful. The code line references BIP44 Altcoin Version Mapping Table might be a bit stale, but the content of this table has strong trace-ability. Example 7 through Example 11 should get things going quickly. These examples merely extend the initial work documented by Andreas M. Antonopoulos in Chapter 4. 

62619: <p>I'm looking for a library or method to generate addresses for as many of the most popular currencies/altcoins as possible. Is there a known library that supports this? Or do I need to use a specific client for each coin?</p>

<p>Thanks!</p>
 67098: <p>Here is my "quite big answer":
I've successfully used <a href="http://cryptolife.net/upwg/" rel="nofollow noreferrer">http://cryptolife.net/upwg/</a> which is stated to be "Open Source JavaScript Client-Side Universal Paper Wallet Generator".  </p>

<p>It doesn't generate wallet addresses by coinname, but instead by the leading character within the wallet address.  I get these from the block explorer for the coin, looking at top address.</p>

<p><a href="http://www.universalwalletgenerator.net/" rel="nofollow noreferrer">http://www.universalwalletgenerator.net/</a> lets you do it by coin name.</p>
 10377: <p>You should find libbitcoin's <a href="https://github.com/libbitcoin/libbitcoin-explorer/wiki/Download-BX" rel="nofollow noreferrer"><strong>bx</strong></a> command line interface to be quite useful. The code line references <a href="https://github.com/libbitcoin/libbitcoin/wiki/Altcoin-Version-Mappings#bip44-altcoin-version-mapping-table" rel="nofollow noreferrer"><strong>BIP44 Altcoin Version Mapping Table</strong></a> might be a bit stale, but the content of this table has strong trace-ability. <a href="https://github.com/libbitcoin/libbitcoin/wiki/Altcoin-Version-Mappings#7-bitcoin-btc-bip-3944-technology-examples" rel="nofollow noreferrer"><strong>Example 7</strong></a> through <a href="https://github.com/libbitcoin/libbitcoin/wiki/Altcoin-Version-Mappings#11-ethereum-eth-bip-3944-technology-examples" rel="nofollow noreferrer"><strong>Example 11</strong></a> should get things going quickly. These examples merely extend the initial work documented by <strong>Andreas M. Antonopoulos</strong> in <a href="https://github.com/bitcoinbook/bitcoinbook/blob/develop/ch04.asciidoc" rel="nofollow noreferrer"><strong>Chapter 4</strong></a>. </p>
