My Voice, My Space

Best Blue Light Filter for Android

sFilter- Blue Light Filter Pro
This application is the best blue light among all the filters I purchased. I think rest of the discussion isn't worth at all. It can sustain more crashes. Less battery drain.

Twilight
Second best goes to Twilight of course. It can sustain crashes but less compared to sFilter.

Bluelight Filter
Third best goes to Hardy, obviously less performance compared to the above filters.

EyeFilter PRO - Bluelight
This is my first filter, crashes like hell. So I had to look for other filters.

Blue Light Filter Pro
No mood to evaluate this filter afterall sFilter overtook all my devices,

Best weather application for Android

Weather & Clock Widget for Android Ad Free
This is the only application I felt worth purchasing, supports both wi-fi & sim devices alike, given it's widgets suites all my needs.
Only trouble I felt is with calendar in the widget which is updated at IST - 6:00 AM instead of 0:00 AM.

Best ebook reader for Android

Librera PRO: Leading book reader and PDF
If one's e-books mainly constitute PDF then blindly go for Lirbi Reader PRO+ (without ads) most innovative application besides any improvements suggested will be incorporated in the application. Outta personal experience, few of my requests got incorporated by the developer in the application for good. Besides it supports various formats. There's no dearth for innovation.

Moon+Reader Pro
If one's e-books mainly constitute epub/mobi then it's better to go for Moon+Reader, is at it's best handling floating text. Especially given it's TTS support, unparalleled.

Google Play Books
One can upload books maximum up to 1000 books exclusive of purchased books. Multi-device page auto-synchronisation & TTS support (Floating Text), inbuilt dictionary, blue light filter makes it worthwhile.

Xodo PDF Reader & Editor
Lacks most important feature, innovation but it's provided for free. Auto crop is where it got it's edge. There's a lot it has to go through.

FBReader Premium – Book Reader
It's bit dull but supports various formats & even supports TTS aided by a @Voice Aloud Reader plugin besides it's price literally nothing.

Universal Book Reader
PDF, one of the basic applications in the Playstore. No auto crop, no auto scroll, no vertical scroll. This is no match to 'Pro Lirbi Reader'. Epub, layout is extraordinary, TTS is inferior to Moon+Reader, no auto scroll. Given its reputation this application could have been far better. Dictionary, only the ones from MobiSystems are supported. This is gross. Last but not least one shouldn't be fooled by its name, it only supports PDF & epub. But plenty of other formats can be converted to either of them if one is willing to shed afew more bucks from wallet besides key.

Text to Speech - NaturalReader
Not bad but crashes abruptly which was brought to the notice of the developer & was promised to release an update with bugs resolved. A plenty of voices are provided but sadly most of them works when connected to internet. Needs lots of improvements. It is at its best handling floating texts. Inbuilt zoom option reduces strain on eyes.

@Voice Aloud Reader
Natural reader is no match to @Voice Aloud Reader but it looks less grandeur to former but latter has various options - record etc which comes handy.

Voice Dream Reader
Premium feel & plenty of voices can be utilized, catch is either reinstall the application or purchase the voice of one's choice. So far so good. No crashes & the application was smooth.

Best offline premium dictionary for Android devices

I use plenty of premium dictionaries, if one's budget is, Copper: Dictionary - WordWeb Audio Dictionary > Advanced English & Thesaurus, Silver: Dictionary - M-W Premium > Dictionary.com Premium > Chambers Dictionary > Dictionary Pro, Gold: Erudite Dictionary & Thesaurus > Oxford American Dictionary & Thesaurus > New Oxford American Dictionary > American Heritage English Free, Diamond: Oxford Dict of English & Thes. > ABBYY Lingvo Dictionaries >Collins English and Thesaurus > Webster's Dictionary+Thesaurus

My primary dictionary is on Touch English Dictionary - Premium rest of them are used for reference. (There're certain areas where these premium dictionaries failed to address like: pop-up, back-up etc; on a whole it suites my needs.)

Those who're interested in purchasing dictionaries from MobiSystems make sure to use it for the entire trial period (30 days) & then proceed to cart. It is worth mentioning, I requested them for a few changes they're kind enough to incorporate it like look up words from other apps etc. Thanks to MobiSystems.

P.S: Webster's Dictionary+Thesaurus (MobiSystems) has got nothing to do with Dictionary - M-W Premium (Merriam-Webster Inc.)
Coming to ABBYY Lingvo Dictionaries I purchased 'English Explanatory Set', so is the resultant screenshot.

ABBYY Lingvo Dictionaries