I would say just read White paper of each coin it will tell you progress weather they working on a plan or its just a coin forgotten. I am always looking different website for coins and youtube to gather more info before investing I am not a rich man yet lol but my favorites are below for many good reasons.

1.Ethereum
2.Credibit  - Crbit shifting to ethereum block chain will be called as Crbit Token will advance techs with DAPS and Creditbay to 10 times faster then bitcoin.
3.PIVX: Very good privacy Masternode benefit , proof of stake for small investers good community.
4.Zclassis: Zclassis is fork of Zcash and Now Zclassic is converting into Zencoin which have more buzz in the market due to Zenapps , ultimate privacy good govern.

Make your own searching before investing ........
Good day