The first I would like to mention is the transcription of Guyana colonial newspapers being transcribed by John Wilmer. These are a valuable source of information for an area for which it is extremely difficult to obtain any primary sources.
A great newspaper source for English research is the 19th Century British newspapers from the British Library. I have accessed these online by being eligible for a reader’s card at the National Library of Australia (NLA) and the State Library of Victoria (SLV). I’ll give some examples of specific interesting items in a subsequent item. The NLA also provides access to the 17th and 18th Century Burney Collection Newspapers, however I’ve yet to explore these fully.
Another great resource provided through the NLA and SLV is the Times Digital Archive. I’ve found a number of Van Cooten and Smithers items in this collection.