Tag merge requests:
MegaDrive/Genesis tags could be merged, as they were the same system, just called Genesis in North America and Megadrive elsewhere
Lesbian/Yuri tags could be merged--they are not identical, but very close in meaning
Boy's love/Yaoi--these could be merged as they mean the same thing
Strategy RPG/Tactical RPG--you could make a case for these remaining separate but most people I've met use them pretty much interchangeably.
Queer/LGBTQIA/LGBT--these could be merged as they may not be identical to each other but are very similar in meaning--possibly to include Gay
Opensource/Sourcecode--these might be able to be merged, since having source code is often conflated with open source but may be tricky as licensing terms might be confusing