TaxTMI 
TaxTMI 
Needless to mention that there are number of Notifications, Circular, Advance ruling, High Court judgments, Supreme Court Cases etc. These are published so as to bring changes to the GST Act and Rules. In case of ambiguity in the interpretation of law, the High Court and Supreme Court cases are also referred. There is still doubt on a particular provision in which case an advance ruling is sought from the department.
One may attempt to keep track of the notifications, circulars by referring to CBIC website www.cbic.gov.in. Since notification, circulars published by the Central Government is replicated by each States and published in their respective GST website one may prefer not to refer GST website of all States. However, one may refer GST website of each States in India to at least refer advance rulings passed by that GST Authority. One may refer website of High Court of each State to find the judgment passed by the Court of that State. One may refer website of Supreme Court to get a copy of landmark judgment. One may also find the judgments in Indiankanoon wesbsite for free. One may also find the judgments in the Google search.
In the busiest work schedule it becomes difficult for anybody to keep a track of all the amendments made to GST law / rules. Thus, it becomes necessary to subscribe to a service provider who are expert in providing access to their online repository where one can find all the notifications, circulars, judgments etc. in an updated version. It saves lot of time and energy and can utilize it in doing productive job. Some of the websites are given below:
Taxmanagementindia.com: The tax management India has repository of 308399 number of case laws, 36170 number of Acts/Rules/Statutes, 39726 number of notifications, 21772 number of circulars/instructions/public notices, 1601 number of forms/returns/challans, 2000 records of schedules and GST rates, 2952 records of duty drawback schedules, 7410 records of Standard Input Output Norms, 1494 records of manuals/ready reckoner, 42521 records of highlights, 5581 records of articles, 15772 records of news, press release, 14928 records of issues/queries in discussion forum, 45874 records of replies/views on the queries and numbers of TMI SMS.
TMI also send the newsletter daily to the subscribed email id. It covers topic like GST, Excise, Service Tax, Income tax, Companies Act etc. The discussion forum is most advantageous venue where one can instantly find the replies of the query either by raising fresh query or search the query already raised by other querist. The participation to discussion forum is free. However, to have access to repository one need to pay minimal amoutn of subscription fee. One can visit the website by clicking on www.taxmanagementindia.com.
Taxguru: The website has a repository of GST, Income tax, company law, excise, customs, DGFT, RBI, SEBI, Finance, corporate law etc. This provides free updates through newsletter. The subscription to newsletter is free of cost. The website name is www.taxguru.in.
Taxindiaonline: The website name is www.taxindiaonline.com. Taxindiaonline.com ('TIOL') was established in the year 2000. It has repository of GST, Income tax, Customs, Excise, Service tax, FEMA, DGFT, SEZ etc. It provides a video coverage of discussion on GST wherein tax experts are invited from various industries, big four tax consultancy firm, government officials to discuss on a particular topic and thereby they share knowledge. It has article section as well.
Taxongo.com: This is a group company of taxindiaonline.com. It has repository of GST, Indirect Tax, Income Tax, DTAA, TP etc. A very nominal fees is charged for providing the access to all the notifications, circular etc.
Cleartax: It provides article in their website which are written by experts on GST.