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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

blo is an alias for bcc and bhs for bcs

They keep me from forever refiguring out whether the carry flag is set on borrow. The mnemonic device is that the 6502 has it backward for when I have to.

I come from the 680x world where in addition to beq and bne, there are four unsigned relative branches:

blo - branch if lower
bls - branch if lower or same
bhs - branch if higher or same
bhi - branch if higher

I do not alias bls or bhi because they are not equivalent to single instructions.

My own tools currently support only the NMOS instruction set because I consider OSI and early Apple II as significantly important platforms. And I do not use undocumented instructions.