I've listed some of the weapons found in D20 Past and sorted them by Traveller Tech level based on their dates. So far I've did up to TL 3.
D20 Modern Progress Levels converted to Traveller Tech Levels
Tech Level 0
Club
Shortspear
Dart
Sling
Javelin
Handaxe, stone
Shortbow
Tech Level 1
All D&D Weapons and equipment
Tech Level 2 - D20 Past
Early Handguns
Wheel lock horse pistol (1530) – pg. 20
Wheel lock belt pistol (1530 – pg. 20
Early Longarms
Matchlock arquebus (1425) – pg. 20
Wheel lock musket (1517) – pg. 20
Wheel lock carbine (1520) – pg. 20
Matchlock musket (1547) – pg. 20
Matchlock caliver (1590) – pg. 20
Cannon
Field Cannon
1-pounder – pg. 21
6-pounder – pg. 21
9-pounder – pg. 21
12-pounder – pg. 21
Siege Cannon
18-pounder – pg. 21
32-pounder – pg. 21
60-pounder – pg. 21
Flintlock Firearms
Snaplock pistol (1580) – pg. 21
Blunderbuss pistol (1680) – pg. 21.
Flintlock Longarms (1570)
Snaplock musket (1570) – pg. 21
Blunderbuss musket (1654) – pg. 21
Brown Bess (.75 musket) (1690) – pg. 21
Explosives and Splash Weapons
Grenades and Explosives
Gunpowder, barrel (1450) – pg. 26
Blast grenade (1667) – pg. 26
Splash Weapons
Acid, mild (early) – pg. 26
Melee Weapons
Pistol whip (1550) – pg. 26
Rifle butt (1460) – pg. 26
Rapier, smallsword (1530) – pg. 26
Saber (1530) – pg. 26
Pistol-axe (1550) – pg. 26
Pistol-mace (1550) – pg 26.
Bayonet (fixed) (1647) – pg 26.
Sailing Ships
Great galley (early) – pg. 28
Cog (early) – pg. 28
Chinese junk (early) – pg. 28
Carrack (1470) – pg. 28
Caravel (1490) – pg. 28
Galleon (1540) – pg. 28
Pinnace (1550) – pg. 28
East Indiaman (1602) – pg. 28
D20 Modern Progress Levels converted to Traveller Tech Levels
Tech Level 0
Club
Shortspear
Dart
Sling
Javelin
Handaxe, stone
Shortbow
Tech Level 1
All D&D Weapons and equipment
Tech Level 2 - D20 Past
Early Handguns
Wheel lock horse pistol (1530) – pg. 20
Wheel lock belt pistol (1530 – pg. 20
Early Longarms
Matchlock arquebus (1425) – pg. 20
Wheel lock musket (1517) – pg. 20
Wheel lock carbine (1520) – pg. 20
Matchlock musket (1547) – pg. 20
Matchlock caliver (1590) – pg. 20
Cannon
Field Cannon
1-pounder – pg. 21
6-pounder – pg. 21
9-pounder – pg. 21
12-pounder – pg. 21
Siege Cannon
18-pounder – pg. 21
32-pounder – pg. 21
60-pounder – pg. 21
Flintlock Firearms
Snaplock pistol (1580) – pg. 21
Blunderbuss pistol (1680) – pg. 21.
Flintlock Longarms (1570)
Snaplock musket (1570) – pg. 21
Blunderbuss musket (1654) – pg. 21
Brown Bess (.75 musket) (1690) – pg. 21
Explosives and Splash Weapons
Grenades and Explosives
Gunpowder, barrel (1450) – pg. 26
Blast grenade (1667) – pg. 26
Splash Weapons
Acid, mild (early) – pg. 26
Melee Weapons
Pistol whip (1550) – pg. 26
Rifle butt (1460) – pg. 26
Rapier, smallsword (1530) – pg. 26
Saber (1530) – pg. 26
Pistol-axe (1550) – pg. 26
Pistol-mace (1550) – pg 26.
Bayonet (fixed) (1647) – pg 26.
Sailing Ships
Great galley (early) – pg. 28
Cog (early) – pg. 28
Chinese junk (early) – pg. 28
Carrack (1470) – pg. 28
Caravel (1490) – pg. 28
Galleon (1540) – pg. 28
Pinnace (1550) – pg. 28
East Indiaman (1602) – pg. 28