Post last updated on 20th January 2018: Good News for all HTC One S owners. Now you can install the latest Lineage OS 14.1 on HTC One S based on Android 7.1.2 Nougat. Lineage OS is a new Open Source project morphed after the death of CyanogenMod OS. However, the man behind the LineageOS seems to be the CEO of Cyanogen.inc Steve Kondik. Today you can enjoy the unofficial build of Lineage OS 14.1 on HTC One S (CM14.1 base ROM).
Remember this is a stable build of Unofficial Lineage OS 14.1 on HTC One S. This is a Stable build and can be used as a daily drive. If you want to try LineageOS then head down to the below guide or steps on How to Install Lineage OS 14.1 on HTC One S.

With the new LineageOS, you can enjoy the latest features which comes with Android Nougat as well as LineageOS features. This is not an official LineageOS ROM built for HTC One S, but you can enjoy the real feature made from the LineageOS gerrit. The ROM is Stable state and can use as a daily driver. Now Download the Android 7.1.2 Nougat Lineage OS 14.1 for HTC One S. You need a Custom Recovery like TWRP to Install Unofficial Lineage OS 14.1 on HTC One S.
Install the Custom ROM Lineage OS 14.1 on HTC One S which is based on Android 7.1.2 Nougat. If you want to try this ROM, then please download and follow the guide on How To Install Lineage OS 14.1 on HTC One S (Android 7.1.2 Nougat). By using TWRP Recovery, you can install the Lineage OS 14.1 on HTC One S (Android 7.1.2 Nougat). Follow the steps below.
What is LineageOS?
LineageOS is based on the Android Open Source Project with extra contributions from many people within the Android community. It can be used without any need to have any Google application installed. Linked below is a package that has come from another Android project that restore the Google parts. LineageOS does still include various hardware-specific code, which is also slowly being open-sourced anyway.
What is in Android 7.1.2 Nougat and its feature?
Android 7.1.2 Nougat comes with handful of features such as App Shortcuts, Multi Window support, restart setting to power menu, Launch the camera by pressing the power button twice, Image Keyboard support, 100 emoji added, GIF Support, Quick Reply via Notification, Notification Redesigned panel, Notifications prioritization, Enhanced Doze Mode, System UI Tuner, Customizable Quick Settings, Don Not Disturb, New Settings Panel Redesigned, Data Saver per App, seamless updates and New Emoji Support.
Great, with Cyanogenmod it was much harder to install.